Year	kg per 2011 PPP $ of GDP
1990	0.467271243753911
1991	0.466125201951836
1992	0.453566415440753
1993	0.444892656751845
1994	0.439772462482786
1995	0.43494803981681
1996	0.428562265932916
1997	0.41928175327878
1998	0.411429612462232
1999	0.396475501043469
2000	0.388445107660598
2001	0.388418135047323
2002	0.383386722288289
2003	0.389623402069196
2004	0.388493388479005
2005	0.385253281154224
2006	0.379175683768049
2007	0.367227679704577
2008	0.368476313567883
2009	0.36645970248716
2010	0.365694653505905
2011	0.366244678437679
2012	0.360786700805382
2013	0.352454409229284
2014	0.343352971123685