year month time cfc11 1977 1 1977.00 139.90 1977 2 1977.08 139.50 1977 3 1977.17 139.00 1977 4 1977.25 134.10 1977 5 1977.33 135.00 1977 6 1977.42 143.40 1977 7 1977.50 140.30 1977 8 1977.58 142.60 1977 9 1977.67 144.70 1977 10 1977.75 144.20 1977 11 1977.83 144.80 1977 12 1977.92 145.70 1978 1 1978.00 148.60 1978 2 1978.08 144.80 1978 3 1978.17 148.40 1978 4 1978.25 147.90 1978 5 1978.33 149.90 1978 6 1978.42 149.50 1978 7 1978.50 152.70 1978 8 1978.58 151.90 1978 9 1978.67 155.10 1978 10 1978.75 153.20 1978 11 1978.83 154.90 1978 12 1978.92 154.70 1979 1 1979.00 157.40 1979 2 1979.08 157.50 1979 3 1979.17 158.80 1979 4 1979.25 158.00 1979 5 1979.33 157.10 1979 6 1979.42 157.60 1979 7 1979.50 159.80 1979 8 1979.58 NA 1979 9 1979.67 163.30 1979 10 1979.75 168.40 1979 11 1979.83 166.50 1979 12 1979.92 165.30 1980 1 1980.00 167.10 1980 2 1980.08 165.80 1980 3 1980.17 168.10 1980 4 1980.25 169.80 1980 5 1980.33 165.80 1980 6 1980.42 169.70 1980 7 1980.50 171.30 1980 8 1980.58 171.90 1980 9 1980.67 169.90 1980 10 1980.75 173.40 1980 11 1980.83 175.70 1980 12 1980.92 172.70 1981 1 1981.00 172.10 1981 2 1981.08 175.20 1981 3 1981.17 176.20 1981 4 1981.25 176.60 1981 5 1981.33 176.80 1981 6 1981.42 177.60 1981 7 1981.50 180.00 1981 8 1981.58 179.10 1981 9 1981.67 182.20 1981 10 1981.75 182.10 1981 11 1981.83 181.50 1981 12 1981.92 183.80 1982 1 1982.00 181.40 1982 2 1982.08 183.00 1982 3 1982.17 182.50 1982 4 1982.25 183.40 1982 5 1982.33 185.10 1982 6 1982.42 184.70 1982 7 1982.50 184.90 1982 8 1982.58 186.20 1982 9 1982.67 188.20 1982 10 1982.75 188.70 1982 11 1982.83 189.10 1982 12 1982.92 188.20 1983 1 1983.00 189.90 1983 2 1983.08 191.10 1983 3 1983.17 192.70 1983 4 1983.25 192.80 1983 5 1983.33 194.10 1983 6 1983.42 197.60 1983 7 1983.50 197.30 1983 8 1983.58 197.40 1983 9 1983.67 198.90 1983 10 1983.75 198.70 1983 11 1983.83 198.60 1983 12 1983.92 201.00 1984 1 1984.00 200.70 1984 2 1984.08 201.70 1984 3 1984.17 200.60 1984 4 1984.25 202.80 1984 5 1984.33 201.70 1984 6 1984.42 203.00 1984 7 1984.50 203.60 1984 8 1984.58 205.10 1984 9 1984.67 206.60 1984 10 1984.75 209.40 1984 11 1984.83 212.30 1984 12 1984.92 211.70 1985 1 1985.00 212.50 1985 2 1985.08 212.00 1985 3 1985.17 215.60 1985 4 1985.25 213.80 1985 5 1985.33 215.20 1985 6 1985.42 216.60 1985 7 1985.50 215.40 1985 8 1985.58 216.80 1985 9 1985.67 217.40 1985 10 1985.75 221.20 1985 11 1985.83 219.40 1985 12 1985.92 224.00 1986 1 1986.00 218.80 1986 2 1986.08 219.10 1986 3 1986.17 222.50 1986 4 1986.25 227.70 1986 5 1986.33 226.00 1986 6 1986.42 225.70 1986 7 1986.50 227.00 1986 8 1986.58 227.40 1986 9 1986.67 231.60 1986 10 1986.75 232.70 1986 11 1986.83 232.80 1986 12 1986.92 233.10 1987 1 1987.00 233.00 1987 2 1987.08 NA 1987 3 1987.17 235.40 1987 4 1987.25 237.50 1987 5 1987.33 NA 1987 6 1987.42 237.30 1987 7 1987.50 236.90 1987 8 1987.58 238.10 1987 9 1987.67 241.00 1987 10 1987.75 243.30 1987 11 1987.83 243.20 1987 12 1987.92 240.80 1988 1 1988.00 240.50 1988 2 1988.08 244.90 1988 3 1988.17 241.60 1988 4 1988.25 246.90 1988 5 1988.33 247.10 1988 6 1988.42 248.20 1988 7 1988.50 248.10 1988 8 1988.58 249.20 1988 9 1988.67 251.50 1988 10 1988.75 252.00 1988 11 1988.83 256.60 1988 12 1988.92 251.40 1989 1 1989.00 255.60 1989 2 1989.08 253.60 1989 3 1989.17 255.20 1989 4 1989.25 257.40 1989 5 1989.33 257.50 1989 6 1989.42 258.80 1989 7 1989.50 257.90 1989 8 1989.58 260.00 1989 9 1989.67 261.90 1989 10 1989.75 261.70 1989 11 1989.83 261.80 1989 12 1989.92 262.20 1990 1 1990.00 263.70 1990 2 1990.08 262.90 1990 3 1990.17 263.60 1990 4 1990.25 262.30 1990 5 1990.33 263.30 1990 6 1990.42 266.80 1990 7 1990.50 263.90 1990 8 1990.58 264.00 1990 9 1990.67 263.50 1990 10 1990.75 267.20 1990 11 1990.83 265.50 1990 12 1990.92 269.30 1991 1 1991.00 269.00 1991 2 1991.08 265.30 1991 3 1991.17 268.10 1991 4 1991.25 270.00 1991 5 1991.33 271.00 1991 6 1991.42 267.30 1991 7 1991.50 270.00 1991 8 1991.58 268.90 1991 9 1991.67 268.60 1991 10 1991.75 267.90 1991 11 1991.83 271.40 1991 12 1991.92 273.40 1992 1 1992.00 272.00 1992 2 1992.08 271.60 1992 3 1992.17 269.30 1992 4 1992.25 273.30 1992 5 1992.33 273.50 1992 6 1992.42 272.00 1992 7 1992.50 272.20 1992 8 1992.58 272.50 1992 9 1992.67 273.60 1992 10 1992.75 274.50 1992 11 1992.83 275.00 1992 12 1992.92 275.40 1993 1 1993.00 275.80 1993 2 1993.08 274.30 1993 3 1993.17 275.00 1993 4 1993.25 271.60 1993 5 1993.33 273.20 1993 6 1993.42 274.60 1993 7 1993.50 273.60 1993 8 1993.58 272.50 1993 9 1993.67 274.10 1993 10 1993.75 273.80 1993 11 1993.83 275.50 1993 12 1993.92 275.50 1994 12 1994.92 272.55 1995 1 1995.00 272.04 1995 2 1995.08 272.23 1995 3 1995.17 272.30 1995 4 1995.25 271.15 1995 5 1995.33 271.16 1995 6 1995.42 271.02 1995 7 1995.50 270.10 1995 8 1995.58 271.34 1995 9 1995.67 271.21 1995 10 1995.75 271.53 1995 11 1995.83 271.40 1995 12 1995.92 NA 1996 1 1996.00 271.30 1996 2 1996.08 271.23 1996 3 1996.17 271.37 1996 4 1996.25 271.37 1996 5 1996.33 271.52 1996 6 1996.42 270.34 1996 7 1996.50 270.03 1996 8 1996.58 269.57 1996 9 1996.67 270.08 1996 10 1996.75 269.61 1996 11 1996.83 269.76 1996 12 1996.92 269.43 1997 1 1997.00 269.65 1997 2 1997.08 269.84 1997 3 1997.17 268.89 1997 4 1997.25 268.67 1997 5 1997.33 268.90 1997 6 1997.42 268.49 1997 7 1997.50 268.06 1997 8 1997.58 268.27 1997 9 1997.67 268.34 1997 10 1997.75 268.55 1997 11 1997.83 268.43 1997 12 1997.92 268.43 1998 1 1998.00 267.65 1998 2 1998.08 268.13 1998 3 1998.17 267.73 1998 4 1998.25 267.33 1998 5 1998.33 266.92 1998 6 1998.42 266.62 1998 7 1998.50 266.22 1998 8 1998.58 266.42 1998 9 1998.67 265.89 1998 10 1998.75 265.75 1998 11 1998.83 266.01 1998 12 1998.92 265.96 1999 1 1999.00 265.87 1999 2 1999.08 265.98 1999 3 1999.17 265.67 1999 4 1999.25 265.50 1999 5 1999.33 265.30 1999 6 1999.42 264.92 1999 7 1999.50 264.09 1999 8 1999.58 263.98 1999 9 1999.67 264.19 1999 10 1999.75 264.49 1999 11 1999.83 264.23 1999 12 1999.92 264.45 2000 1 2000.00 264.39 2000 2 2000.08 264.05 2000 3 2000.17 264.02 2000 4 2000.25 263.50 2000 5 2000.33 263.60 2000 6 2000.42 263.72 2000 7 2000.50 263.59 2000 8 2000.58 263.49 2000 9 2000.67 263.45 2000 10 2000.75 263.52 2000 11 2000.83 263.76 2000 12 2000.92 263.45 2001 1 2001.00 263.66 2001 2 2001.08 263.79 2001 3 2001.17 263.39 2001 4 2001.25 262.98 2001 5 2001.33 262.18 2001 6 2001.42 262.25 2001 7 2001.50 262.28 2001 8 2001.58 261.54 2001 9 2001.67 261.39 2001 10 2001.75 261.68 2001 11 2001.83 262.07 2001 12 2001.92 261.88 2002 1 2002.00 261.21 2002 2 2002.08 260.70 2002 3 2002.17 260.72 2002 4 2002.25 259.92 2002 5 2002.33 259.47 2002 6 2002.42 259.39 2002 7 2002.50 258.79 2002 8 2002.58 258.64 2002 9 2002.67 258.81 2002 10 2002.75 258.86 2002 11 2002.83 258.85 2002 12 2002.92 258.78 2003 1 2003.00 258.48 2003 2 2003.08 258.27 2003 3 2003.17 257.91 2003 4 2003.25 257.46 2003 5 2003.33 256.97 2003 6 2003.42 256.98 2003 7 2003.50 256.80 2003 8 2003.58 255.81 2003 9 2003.67 256.61 2003 10 2003.75 256.28 2003 11 2003.83 256.52 2003 12 2003.92 256.25 2004 1 2004.00 255.62 2004 2 2004.08 255.63 2004 3 2004.17 255.36 2004 4 2004.25 255.34 2004 5 2004.33 255.13 2004 6 2004.42 254.48 2004 7 2004.50 254.19 2004 8 2004.58 254.23 2004 9 2004.67 254.10