Year	kg per 2015 US$ of GDP
1990	0.17941255139427784
1991	0.17702664818976366
1992	0.1737822148815319
1993	0.17904419634994556
1994	0.18791806579447135
1995	0.21839503010229117
1996	0.1776634695437571
1997	0.2272447826191433
1998	0.22330669891378674
1999	0.2450341647706955
2000	0.2932619618620047
2001	0.3257685518532235
2002	0.25450996957193867
2003	0.27533844404600594
2004	0.31732625164393663
2005	0.32421604076690774
2006	0.3241854968949942
2007	0.32189656462022265
2008	0.3036128501881511
2009	0.30368332343688337
2010	0.3176762241999448
2011	0.2807351430302251
2012	0.31153564506745
2013	0.32297331121435524
2014	0.3237863924514478
2015	0.33454338728347455
2016	0.32842577924029687
2017	0.319136264504905
2018	0.3076441820325528
2019	0.30712271708191813
2020	0.344368104719741