Year	kg per 2011 PPP $ of GDP
1990	0.53182278251329
1991	0.513986718414082
1992	0.60231004729156
1993	0.573301020088616
1994	0.57082217531082
1995	0.484544885213561
1996	0.435118417927817
1997	0.407177725330996
1998	0.39152866874197
1999	0.438528698258599
2000	0.397785853011869
2001	0.354754476252331
2002	0.369888943376564
2003	0.396867945352894
2004	0.375085860644994
2005	0.45162457576826
2006	0.453801054973934
2007	0.445713939617768
2008	0.425503965490442
2009	0.273906379341517
2010	0.317698271994841
2011	0.342088769190706
2012	0.238917511339343
2013	0.350999643315213
2014	0.352972170924102