Year	kg per 2011 PPP $ of GDP
1990	0.393595212683699
1991	0.391836024993811
1992	0.387489529359489
1993	0.387722336817933
1994	0.380161908395288
1995	0.371745349311285
1996	0.370551822257901
1997	0.360682541851106
1998	0.35095424474553
1999	0.344470099005659
2000	0.341478101986558
2001	0.335496180131914
2002	0.332235288359273
2003	0.329310061493928
2004	0.323433775249826
2005	0.314424502831066
2006	0.304917714687705
2007	0.298213635210942
2008	0.292711496961041
2009	0.286423701224471
2010	0.287498949438814
2011	0.276664039134405
2012	0.270079168017966
2013	0.265677547832142
2014	0.259896214913709