Year	Mt of CO2 equivalent
1990	-19.0581447488475
1991	-18.876708036890193
1992	-17.701267664556003
1993	-16.924374974094263
1994	-19.022755148841267
1995	-19.231389097868856
1996	-19.8705744735825
1997	-21.470956673025277
1998	-22.332133780787103
1999	-22.720203560239064
2000	-23.280881904127558
2001	-23.20336633505722
2002	-23.38220396738343
2003	-22.553313501642087
2004	-24.25875739946487
2005	-24.5955603182005
2006	-27.65481659307538
2007	-29.660013554006376
2008	-29.118366605454703
2009	-28.62795615819774