Year	kg per 2015 US$ of GDP
1990	0.3738128095537191
1991	0.4209855471549698
1992	0.45190625691920755
1993	0.43296955040760726
1994	0.4011442742206264
1995	0.43065308797443036
1996	0.47545711740203683
1997	0.45544333394091
1998	0.42365675110205997
1999	0.4252848139976245
2000	0.436453259995503
2001	0.43615594900795135
2002	0.3720219063035964
2003	0.3767432372048126
2004	0.3525461351012005
2005	0.33822310244215226
2006	0.3045585736396462
2007	0.27976079692182343
2008	0.2771099808673846
2009	0.25146625443689946
2010	0.26420336523802135
2011	0.2613393997259924
2012	0.25586187743752153
2013	0.26397759410874944
2014	0.26238273176943755
2015	0.25262788729030605
2016	0.26140266298587844
2017	0.2544866783011607
2018	0.25987501042066
2019	0.2665513458919153
2020	0.26071320961920436