Year	thousand metric tons of CO2 equivalent
1970	63.00507108783698
1971	62.72866014909697
1972	69.18653598070098
1973	64.44074163865997
1975	76.40928298997902
1977	75.32915158987001
1978	77.125595710754
1980	68.12365766811402
1981	327.577729482651
1982	363.99780210638005
1983	545.0745084366799
1984	477.795209924698
1985	257.202149345398
1986	134.61034286546703
1987	97.21944406938603
1988	134.22835166835793
1989	142.1171183414461