************************************************************* *** Source: Thomas J. Conway *** *** Pieter Tans *** *** Lee S. Waterman *** *** National Oceanic & Atmospheric Administration *** *** Climate Monitoring and Diagnostics Laboratory *** *** 325 Broadway *** *** Boulder, Colorado 80303 *** ************************************************************* 1975 328.7 328.7 328.6 328.7 328.9 329.1 329.4 329.9 330.1 330.3 330.5 330.1 329.4 1976 329.4 329.2 329.2 329.4 329.6 329.8 330.2 330.7 331.1 331.5 331.5 331.1 330.2 1977 330.8 330.7 330.5 330.5 330.7 331.0 331.6 332.5 333.0 332.8 332.5 332.4 331.6 1978 332.4 332.4 332.3 332.6 333.2 333.5 333.9 334.4 334.9 335.3 335.3 334.8 333.8 1979 334.6 334.6 334.5 334.6 335.0 335.3 335.7 336.3 336.4 336.4 336.4 336.3 335.5 1980 336.0 335.6 335.5 335.7 336.3 336.9 337.0 337.1 337.3 337.5 337.6 337.5 336.7 1981 337.6 337.7 337.6 337.8 338.0 338.1 338.7 339.3 339.3 339.2 339.3 339.1 338.5 1982 338.9 338.6 338.5 338.7 339.0 339.1 339.4 339.8 340.1 340.2 340.0 339.8 339.3 1983 339.7 339.5 339.5 340.0 340.4 340.7 341.0 341.5 341.8 341.8 341.8 341.7 340.8 1984 341.6 341.5 341.5 341.4 341.6 341.8 342.2 342.7 343.0 343.1 343.0 342.9 342.2 1985 342.8 342.9 342.8 342.8 343.1 343.4 343.9 344.4 344.6 344.6 344.6 344.5 343.7 1986 344.4 344.2 344.1 344.2 344.4 344.7 345.0 345.6 345.9 345.9 345.8 345.7 345.0 1987 345.7 345.7 345.8 346.0 346.2 346.6 347.1 347.6 348.0 348.2 348.3 348.3 347.0 1988 348.1 347.9 348.0 348.2 348.4 348.7 349.1 349.5 349.8 349.9 349.9 349.8 348.9 1989 349.9 349.8 349.8 349.8 350.0 350.2 350.7 351.2 351.3 351.5 351.8 351.6 350.6 1990 351.0 350.8 350.7 351.0 351.4 351.6 351.9 352.3 352.5 352.7 352.7 352.6 351.8 1991 352.5 352.2 352.2 352.5 352.6 352.8 353.4 353.7 353.8 353.7 353.7 353.7 353.1 1992 353.5 353.0 352.9 353.1 353.5 353.9 354.4 354.8 355.0 355.0 354.9 354.8 354.1