Year	kg per 2011 PPP $ of GDP
1990	0.85994089909546
1991	0.905129305297722
1992	0.854841684845979
1993	0.898619190055448
1994	0.919896669767079
1995	0.952982266975577
1996	0.919094838296163
1997	0.949224202823033
1998	0.923943106333369
1999	0.896340532874228
2000	0.868071612993065
2001	0.830467062274735
2002	0.767673310481036
2003	0.845670676942539
2004	0.90027723127912
2005	0.791951227890686
2006	0.80564994364514
2007	0.796557353471625
2008	0.821879123777531
2009	0.845371232459613
2010	0.773119905837555
2011	0.742984394708911
2012	0.724097445053534
2013	0.702929442675626
2014	0.724804352673476