% Atmospheric lifetimes are 44.0 for CFC-11 % and 125.0 for CFC-12 % rel= 0 % <-Northern Data-> <-Southern Data-> % Year CFC-11 CFC-12 CFC-11 CFC-12 % (ppt) (ppt) (ppt) (ppt) 1931.50 0.00 0.00 0.00 0.00 1932.50 0.00 0.01 0.00 0.01 1933.50 0.00 0.02 0.00 0.01 1934.50 0.00 0.03 0.00 0.02 1935.50 0.00 0.04 0.00 0.03 1936.50 0.00 0.07 0.00 0.04 1937.50 0.00 0.11 0.00 0.07 1938.50 0.00 0.17 0.00 0.11 1939.50 0.01 0.25 0.00 0.17 1940.50 0.01 0.37 0.01 0.25 1941.50 0.02 0.53 0.01 0.36 1942.50 0.02 0.72 0.02 0.51 1943.50 0.03 0.94 0.02 0.69 1944.50 0.04 1.25 0.03 0.91 1945.50 0.05 1.65 0.04 1.21 1946.50 0.08 2.33 0.05 1.64 1947.50 0.14 3.42 0.08 2.33 1948.50 0.24 4.73 0.14 3.32 1949.50 0.42 6.10 0.25 4.48 1950.50 0.67 7.58 0.42 5.77 1951.50 1.02 9.23 0.66 7.19 1952.50 1.53 10.94 1.01 8.72 1953.50 2.21 12.82 1.49 10.37 1954.50 3.07 14.97 2.13 12.20 1955.50 4.11 17.40 2.93 14.25 1956.50 5.39 20.22 3.92 16.59 1957.50 6.84 23.45 5.11 19.28 1958.50 8.19 26.86 6.39 22.28 1959.50 9.47 30.58 7.63 25.52 1960.50 11.13 35.03 8.96 29.18 1961.50 13.38 40.12 10.63 33.42 1962.50 16.23 45.89 12.78 38.25 1963.50 19.72 52.66 15.47 43.80 1964.50 23.87 60.57 18.75 50.28 1965.50 28.57 69.53 22.61 57.76 1966.50 33.78 79.46 26.99 66.21 1967.50 39.63 90.60 31.91 75.67 1968.50 46.27 103.16 37.46 86.31 1969.50 53.96 117.17 43.80 98.25 1970.50 62.75 132.52 51.07 111.52 1971.50 72.36 149.00 59.27 126.02 1972.50 83.04 166.85 68.34 141.70 1973.50 95.27 186.59 78.54 158.82 1974.50 108.81 208.14 90.04 177.62 1975.50 121.86 229.37 102.29 197.54 1976.50 134.47 249.51 114.40 217.31 1977.50 146.47 268.67 126.28 236.49 1978.50 157.18 286.35 137.45 254.72 1979.50 166.67 303.74 147.60 272.00 1980.50 175.11 320.96 158.08 290.34 1981.50 182.81 337.33 166.54 306.90 1982.50 189.88 352.01 174.69 323.74 1983.50 197.72 367.69 183.03 341.15 1984.50 206.34 383.86 190.95 357.80 1985.50 216.12 401.25 200.50 376.45 1986.50 227.48 420.96 209.82 394.00 1987.50 239.67 441.49 220.60 412.82 1988.50 251.05 463.22 231.46 433.46 1989.50 257.28 481.80 240.38 452.97 1990.50 263.65 493.96 249.23 470.55 1991.50 266.33 504.64 254.53 484.07 1992.50 266.00 512.87 258.80 495.65 1993.50 267.58 520.12 260.56 504.49 1994.50 267.24 526.58 261.73 512.31 1995.50 266.38 531.59 261.29 518.39 1996.50 265.25 534.81 261.08 523.50 1997.50 263.84 537.67 260.16 528.18 1998.50 262.24 999.99 258.96 999.99 1999.50 260.72 999.99 257.75 999.99 2000.50 259.34 999.99 255.69 999.99 2001.50 257.13 999.99 253.54 999.99 2002.50 254.89 999.99 252.93 999.99 2003.50 251.89 999.99 250.62 999.99 2004.50 250.67 999.99 249.52 999.99 2005.50 249.49 999.99 247.45 999.99 2006.50 248.31 999.99 245.38 999.99 2007.50 247.13 999.99 243.31 999.99 2008.50 245.95 999.99 241.24 999.99