Year	thousand metric tons of CO2 equivalent
1970	-484.14977612151995
1971	-475.20660237274
1972	-509.07777413329995
1973	-476.5969789367701
1974	-420.46169776459
1975	-401.5073638030998
1976	-427.2801070953401
1977	-409.6990988189698
1978	-387.8753162262001
1979	-199.4505216186502
1980	-177.78077829589807
1981	-181.96690622863815
1982	-131.5925906433112
1983	-222.846615176392
1984	-233.73730858459504
1985	-175.00998448791518
1986	-149.97999350891104
1987	-152.92930529480003
1988	-165.8245658538815
1989	-214.59106918945326