Year	kg per 2011 PPP $ of GDP
1990	0.940695340126358
1991	0.993051565201004
1992	0.950213411756867
1993	0.912117920128598
1994	0.818985852385325
1995	0.78923521754598
1996	0.769113039769583
1997	0.709795545057479
1998	0.631717898286258
1999	0.585681203825601
2000	0.53098812295298
2001	0.527939899519463
2002	0.506299930405328
2003	0.501185008374481
2004	0.480115538097743
2005	0.461046962701649
2006	0.45775555496316
2007	0.421410601954571
2008	0.404972529140854
2009	0.372309135669092
2010	0.381862021894464
2011	0.36446140218325
2012	0.339382908690674
2013	0.337343038205496
2014	0.308644216203695