Year	thousand metric tons of CO2 equivalent
1969	0
1970	9.77813594
1971	9.48096157
1972	9.23914049
1973	9.01124616
1974	8.80715611
1975	9.26742427
1976	10.10975441
1977	10.35801016
1978	11.4232396
1979	11.08893746
1980	12.2139938
1981	13.25095093
1982	12.82566472
1983	12.49482621
1984	15.306215032
1985	11.407843109
1986	11.667198409
1987	11.143013116
1988	11.238038873
1989	11.219000347
1990	10.882247223
1991	11.004099605
1992	11.579336783
1993	11.995020123
1994	12.214056978
1995	12.028810681
1996	12.11610045
1997	11.784971377
1998	12.507349652
1999	13.103590198
2000	20.194320049
2001	13.921403864
2002	19.672376645
2003	20.163009491
2004	19.551224615
2005	19.604965595
2006	19.371382982
2007	19.294184054
2008	19.135569454