Year	kg per 2015 US$ of GDP
1990	0.36732186139918804
1991	0.35950895345027467
1992	0.3392957694656505
1993	0.3200524719299285
1994	0.3235405030194299
1995	0.328021335615424
1996	0.33675685688835366
1997	0.3347362514751894
1998	0.3401719267777089
1999	0.3401987091331303
2000	0.335216990968758
2001	0.33983753785904924
2002	0.3410851078445808
2003	0.34426710613883543
2004	0.3407106447297982
2005	0.3509428316677498
2006	0.34739392955178844
2007	0.35086206573064466
2008	0.3431805961647736
2009	0.33756456568655896
2010	0.33559645914316183
2011	0.33909475084513063
2012	0.33930422449750985
2013	0.32449438482767146
2014	0.32533821169427907
2015	0.3276995349887554
2016	0.34229642207912253
2017	0.3534995247307345
2018	0.3581446317946917
2019	0.3517688868851
2020	0.3376638849888812