Year	Mt of CO2 equivalent
1990	-4.330583533281366
1991	-4.670693751050017
1992	-4.677666344501971
1993	-4.701867539924318
1994	-4.701545270174657
1995	-4.7135911272018625
1996	-4.725386600710333
1997	-4.744642592311812
1998	-4.133241433524714
1999	-4.128580788237005
2000	-4.12179755601301
2001	-4.3162492457374055
2002	-4.519976078097472
2003	-3.671762436132474
2004	-3.797663862374088
2005	-3.2701832966376085
2006	-3.432030987811911
2007	-3.9603025859484102
2008	-3.9582438200712944
2009	-3.7499319020141764