Year	kg per 2015 US$ of GDP
1990	0.39340232886161336
1991	0.40801236407977204
1992	0.4288458322294731
1993	0.39527787038057566
1994	0.45073092469176806
1995	0.453531429413344
1996	0.4598810852067842
1997	0.4812281787069668
1998	0.5166601266069508
1999	0.522263007100592
2000	0.523583449975584
2001	0.5195845111423586
2002	0.5470098643964624
2003	0.49715277387960655
2004	0.44734388446941337
2005	0.44212081921253393
2006	0.44131784281788855
2007	0.41605957032510615
2008	0.4022321401153058
2009	0.3805711308337479
2010	0.36956776757015974
2011	0.3623784363807965
2012	0.36574025412204114
2013	0.34239637240820686
2014	0.3223023934047043
2015	0.33149100543994103
2016	0.3240086610144848
2017	0.29644396512571514
2018	0.29844675606340704
2019	0.2886768108780557
2020	0.2747281282750858