Year	kg per 2011 PPP $ of GDP
1990	0.52277614168777
1991	0.523154173033342
1992	0.516365351992908
1993	0.514197710442484
1994	0.501048447451289
1995	0.49228340718265
1996	0.486319225890862
1997	0.4764353838263
1998	0.459594178056282
1999	0.446955237405893
2000	0.443700059884342
2001	0.431672318681849
2002	0.426404605669384
2003	0.419490398027092
2004	0.409528486458523
2005	0.398166481755246
2006	0.380716617379133
2007	0.379772751224342
2008	0.369853234751319
2009	0.356555771545875
2010	0.355291340745957
2011	0.343311830727125
2012	0.32495384602227
2013	0.32118055667324
2014	0.319750007815003