Year	kg per 2011 PPP $ of GDP
1990	0.37203800772012
1991	0.391357522520562
1992	0.394070845660482
1993	0.389441407044223
1994	0.385830622303284
1995	0.380627831603676
1996	0.384767594650343
1997	0.384611824300428
1998	0.369527626111344
1999	0.36108894844683
2000	0.360334528188668
2001	0.346850088360259
2002	0.338345595792125
2003	0.327178772665826
2004	0.318246667634467
2005	0.312315189423168
2006	0.30820339418091
2007	0.309084854812689
2008	0.334075602234429
2009	0.343349708245274
2010	0.313008351643054
2011	0.31853426422258
2012	0.331036538402896
2013	0.313670003832764
2014	0.321254386847079