Year	kg per 2010 US$ of GDP
1991	0.724799085068238
1992	0.678201798229301
1993	0.69931951097868
1994	0.646028513237826
1995	0.652601382085574
1996	0.670820335173291
1997	0.636826492253332
1998	0.593653929785016
1999	0.571788884800037
2000	0.520942202023074
2001	0.512022527388435
2002	0.481991673912421
2003	0.488870114672523
2004	0.452992871163876
2005	0.438187510651538
2006	0.41735108856458
2007	0.405796599446347
2008	0.393813401919771
2009	0.37295788697303
2010	0.383609989096504
2011	0.359473371487076
2012	0.340534977061134
2013	0.315280061572991
2014	0.302105623853044