Year	kg per 2015 US$ of GDP
1990	0.46179858780860894
1991	0.510108423621638
1992	0.5001105970381746
1993	0.5198449165577406
1994	0.5116023053673724
1995	0.4618620916840988
1996	0.4845052776518009
1997	0.47915252414620757
1998	0.47340981411214594
1999	0.468685161017124
2000	0.45881819535566104
2001	0.4329758363185797
2002	0.4279661611307223
2003	0.45574754223244707
2004	0.43087329946603586
2005	0.417375707670618
2006	0.40356126509606116
2007	0.3987555724482566
2008	0.3932283985538314
2009	0.39117282255126795
2010	0.3649860758692954
2011	0.3513317996247765
2012	0.33833899604544465
2013	0.3279575524764471
2014	0.35383972093698346
2015	0.3441562810735319
2016	0.34023908528496977
2017	0.32811889132642835
2018	0.30371815827554594
2019	0.28747905664317275
2020	0.2803754372554041