Year	kg per 2015 US$ of GDP
1990	0.6433708630715023
1991	0.6421143940370362
1992	0.6387976804296985
1993	0.6515093275286727
1994	0.6494164834943268
1995	0.6654644976585793
1996	0.638482107462963
1997	0.627685551290318
1998	0.6240677567087535
1999	0.6056005446417343
2000	0.6025922418964492
2001	0.6051065289647259
2002	0.6107528314072764
2003	0.641251554406539
2004	0.6687059368307192
2005	0.6889111674133995
2006	0.6929471770492158
2007	0.6889569381327807
2008	0.6718378738168328
2009	0.6840938457545919
2010	0.6908409088346684
2011	0.7070596268512211
2012	0.6899699540154042
2013	0.677922180055676
2014	0.6494827751363788
2015	0.6142319966103754
2016	0.5886298399682954
2017	0.5735318121219388
2018	0.5698686953291904
2019	0.5582630743271718
2020	0.5592574985337107