Year	kg per 2011 PPP $ of GDP
1990	0.328561992354078
1991	0.315886796415864
1992	0.308620562909124
1993	0.317136360880728
1994	0.36003351070039
1995	0.362233101873498
1996	0.348348674059711
1997	0.338181204925212
1998	0.379169979657969
1999	0.465926093585222
2000	0.428512362445776
2001	0.455130307223114
2002	0.427840368004519
2003	0.409805678558301
2004	0.419465099486565
2005	0.426295340286184
2006	0.441097278372412
2007	0.41583049452753
2008	0.432568227690667
2009	0.438292690257285
2010	0.428289597798068
2011	0.42891871876448
2012	0.481278426691637
2013	0.488535773206019
2014	0.489418729137927