Time (yrs),C02 (ppm)
1958.00,309
1958.25,317
1958.50,318
1958.75,321
1959.00,320
1959.25,310
1959.50,309
1959.75,310
1960.00,312
1960.25,311
1960.50,320
1960.75,323
1961.00,310
1961.25,316
1961.50,321
1961.75,307
1962.00,317
1962.25,311
1962.50,321
1962.75,324
1963.00,315
1963.25,327
1963.50,315
1963.75,328
1964.00,320
1964.25,329
1964.50,313
1964.75,327
1965.00,318
1965.25,317
1965.50,315
1965.75,321
1966.00,322
1966.25,316
1966.50,324
1966.75,318
1967.00,330
1967.25,325
1967.50,313
1967.75,313
1968.00,326
1968.25,319
1968.50,326
1968.75,326
1969.00,330
1969.25,317
1969.50,325
1969.75,328
1970.00,320
1970.25,324
1970.50,328
1970.75,321
1971.00,326
1971.25,316
1971.50,329
1971.75,332
1972.00,315
1972.25,318
1972.50,324
1972.75,331
1973.00,321
1973.25,334
1973.50,331
1973.75,330
1974.00,333
1974.25,328
1974.50,322
1974.75,332
1975.00,326
1975.25,333
1975.50,336
1975.75,330
1976.00,331
1976.25,338
1976.50,335
1976.75,329
1977.00,329
1977.25,335
1977.50,338
1977.75,340
1978.00,329
1978.25,335
1978.50,332
1978.75,331