Year	kg per 2011 PPP $ of GDP
1992	0.454467727646651
1993	0.440037500765654
1994	0.414842636388191
1995	0.405710406928584
1996	0.402536910752919
1997	0.376490199314548
1998	0.368113554046024
1999	0.355290476382911
2000	0.34194514916626
2001	0.33801967353694
2002	0.330052867946707
2003	0.331266603835646
2004	0.320770304165246
2005	0.310417644520464
2006	0.302551778875593
2007	0.288473185453333
2008	0.283270048824186
2009	0.272814383303902
2010	0.278211285426991
2011	0.269759039589848
2012	0.267847470765938
2013	0.259192116056634
2014	0.242559786988264