Year	thousand metric tons of CO2 equivalent
1970	0
1971	0.20000000000000506
1972	0.399999999999999
1973	0.6000000000000005
1974	0.8000000000000052
1975	1.000000000000004
1976	1.1999999999999953
1977	1.399999999999999
1978	1.6000000000000036
1979	1.8000000000000016
1980	2.0000000000000067
1981	2.1999999999999984
1982	2.399999999999997
1983	2.5999999999999965
1984	2.800000000000002
1985	3.000000000000002
1986	3.200000000000003
1987	3.399999999999994
1988	3.6000000000000054
1989	3.799999999999996