Year	thousand metric tons of CO2 equivalent
1970	-1.1088940063491501
1971	-1.11460495740175
1972	-1.15359597187489
1973	-1.2216270044446
1974	-1.34980299230665
1975	-1.77339697442949
1976	-1.9210929340624703
1977	-1.93112398963422
1978	-2.11371799744666
1979	-2.0893200319260394
1980	-2.8624889459461
1981	-3.0460780756548
1982	-3.2067280681803796
1983	-3.40957393590361
1984	-3.77520090062171
1985	-3.82277699094266
1986	-3.9873099196702206
1987	-5.95362102612853
1988	-5.84092794917524
1989	-6.46882397308946