Year	kg per PPP $ of GDP
1990	1.0943273498657
1991	1.00677884545962
1992	0.808136316526331
1993	0.802048220980253
1994	0.734082329377066
1995	0.725049509378534
1996	0.712947457911067
1997	0.67602766853848
1998	0.674724950662621
1999	0.661010503154274
2000	0.790906774964858
2001	0.807462955631428
2002	0.831798864313299
2003	0.841756584125844
2004	0.775893402810294
2005	0.772581072328375
2006	0.741091343479015
2007	0.736687159009767
2008	0.681017084891127
2009	0.746988074430784
2010	0.731350322843702
2011	0.690496144344123
2012	0.370650692906782
2013	0.223238507082747
2014	0.220024128705649