************************************************************* *** Source: Thomas J. Conway *** *** Pieter Tans *** *** Lee S. Waterman *** *** National Oceanic & Atmospheric Administration *** *** Climate Monitoring and Diagnostics Laboratory *** *** 325 Broadway *** *** Boulder, Colorado 80303 *** ************************************************************* 1968 323.7 325.1 326.1 326.5 326.5 324.0 320.1 318.2 318.9 321.1 323.2 324.1 323.1 1969 324.5 325.6 327.1 327.9 327.1 325.1 321.3 318.6 319.4 322.2 323.9 325.4 324.0 1970 326.6 327.4 329.0 330.5 329.2 326.1 322.3 319.5 320.6 324.2 326.1 326.4 325.7 1971 327.4 328.9 329.7 330.2 329.1 324.6 320.7 319.7 320.2 323.0 325.6 326.3 325.5 1972 327.4 328.8 329.3 330.4 329.3 324.3 320.6 320.4 322.1 325.4 328.6 329.9 326.4 1973 330.7 331.7 332.5 333.3 333.5 331.2 327.4 325.5 326.6 328.4 330.6 331.9 330.3 1974 332.6 333.8 335.2 336.0 334.9 332.0 -99.99 -99.99 -99.99 -99.99 -99.99 -99.99 -99.99 1975 -99.99 -99.99 -99.99 -99.99 -99.99 -99.99 -99.99 -99.99 -99.99 -99.99 -99.99 -99.99 -99.99 1976 332.8 334.3 334.6 335.0 334.5 332.3 330.2 328.1 327.6 330.0 332.1 333.6 332.1 1977 334.8 335.8 336.6 337.3 337.3 335.3 332.7 331.4 331.5 333.4 335.2 336.4 334.8 1978 337.4 338.0 338.4 338.5 338.7 337.4 333.8 331.0 330.9 333.4 335.0 336.5 335.8 1979 338.0 338.7 339.9 340.5 340.5 338.1 334.4 332.6 332.5 334.1 336.7 338.0 337.0 1980 339.3 340.7 341.6 341.8 339.5 335.9 334.1 334.1 335.0 336.4 338.6 339.8 338.1 1981 341.2 343.1 343.6 343.2 341.9 339.6 337.2 335.4 335.4 338.0 341.0 341.8 340.1 1982 342.3 343.9 345.1 345.4 344.0 340.5 336.7 334.9 336.6 339.6 340.7 341.4 340.9 1983 343.3 344.7 345.3 346.1 345.1 342.4 339.4 336.5 336.7 340.3 343.6 345.8 342.4 1984 345.7 346.2 348.0 349.1 348.4 345.1 340.1 338.6 340.7 343.2 344.9 345.9 344.7 1985 347.1 347.8 348.1 348.6 347.8 345.7 344.7 343.8 342.1 343.5 346.6 347.6 346.1 1986 347.9 349.1 349.6 349.8 348.7 345.6 344.2 344.2 344.3 345.1 346.2 347.7 346.9 1987 349.0 350.4 351.8 351.8 350.8 349.6 347.4 344.9 345.2 347.1 349.4 351.3 349.1 1988 352.5 353.7 354.4 355.3 354.4 351.4 349.7 348.3 348.0 349.6 352.5 354.1 352.0 1989 354.3 355.0 355.5 355.8 355.7 354.7 352.6 349.7 349.1 351.1 353.6 354.5 353.5 1990 355.3 357.0 357.5 357.8 358.0 355.9 352.0 350.2 351.2 352.2 353.7 355.7 354.7 1991 357.2 358.4 359.4 360.0 358.6 356.7 353.7 351.3 351.3 353.3 356.0 357.7 356.1 1992 358.8 359.3 360.1 359.7 357.5 356.6 356.1 354.0 352.8 354.1 355.9 357.1 356.8