Year	kg per 2011 PPP $ of GDP
1990	0.241312161182937
1991	0.244262939326758
1992	0.24863508040938
1993	0.261423819661045
1994	0.269594522417764
1995	0.288757233777612
1996	0.305703854589475
1997	0.324234156280632
1998	0.310305795935357
1999	0.318004560664011
2000	0.313332674348789
2001	0.325173472724031
2002	0.327938014188663
2003	0.329810731062798
2004	0.336013972712987
2005	0.328183056836555
2006	0.318437308047709
2007	0.302501079740247
2008	0.297365150692437
2009	0.317414580051747
2010	0.311034184310711
2011	0.304495669022618
2012	0.3025798121308
2013	0.29812933515768
2014	0.311085475023672