Year	kg per 2011 PPP $ of GDP
1990	0.0374052008260763
1991	0.040625084542153
1992	0.0365063630659855
1993	0.0409157623887291
1994	0.0439176725485304
1995	0.0484403629277982
1996	0.0534626079124269
1997	0.055972652106816
1998	0.0534345127536386
1999	0.0547735270328945
2000	0.0592503178730547
2001	0.0439348623668375
2002	0.0435667601470006
2003	0.0334601063051393
2004	0.0391712707485452
2005	0.0301947907980801
2006	0.0347820689765528
2007	0.0336214717456147
2008	0.0326913563687974
2009	0.031490695828314
2010	0.0334121447923367
2011	0.0365469243059654
2012	0.0408228072312951
2013	0.0399175231054702
2014	0.0581675299952735