Year	kg per 2010 US$ of GDP
1990	0.342026805252705
1991	0.330112500474601
1992	0.321155891144962
1993	0.308475419782339
1994	0.279711340423236
1995	0.294446743114521
1996	0.313112510744009
1997	0.284639393698961
1998	0.246438430484379
1999	0.250353435912243
2000	0.252807181949934
2001	0.248742462359776
2002	0.345840137307766
2003	0.357766411330646
2004	0.362670371601294
2005	0.376916809167754
2006	0.246015747657701
2007	0.346987928009727
2008	0.321334922749208
2009	0.336239939597672
2010	0.23044992428828
2011	0.214340212102039
2012	0.334334551781511
2013	0.319702339332079
2014	0.315450032882524