Year	kg per 2011 PPP $ of GDP
1990	0.71365640525932
1991	0.613206309434615
1992	0.527553935873367
1993	0.627758667517641
1994	0.635636359563515
1995	0.612813703369716
1996	0.620521373103835
1997	0.667322724841813
1998	0.676729817853022
1999	0.635256276977126
2000	0.624152917710144
2001	0.454940447827865
2002	0.494909461734674
2003	0.489688154891901
2004	0.486679980424369
2005	0.500023793007951
2006	0.460409432490115
2007	0.606144288000083
2008	0.632623953066974
2009	0.584807399899753
2010	0.581345069686522
2011	0.558037286153917
2012	0.500846779991244
2013	0.557737691372236
2014	0.534926449805485