Year	kg per 2015 US$ of GDP
1990	0.18796243189063955
1991	0.23826828658419436
1992	0.24351672502517674
1993	0.26919646907438805
1994	0.2922609414112923
1995	0.310470472542819
1996	0.27249640372532175
1997	0.32013553848944704
1998	0.33220860653020046
1999	0.32172332121641556
2000	0.31958782887920656
2001	0.3301334497132862
2002	0.32871518367558483
2003	0.3549978044053676
2004	0.3608727965166187
2005	0.35984669607138436
2006	0.36500314184531507
2007	0.37789824352833
2008	0.33505464690096104
2009	0.3307308774944282
2010	0.317084336307095
2011	0.3167449957628172
2012	0.30753261782112046
2013	0.286927061038554
2014	0.2880085196599869
2015	0.29855484029517576
2016	0.296467181767395
2017	0.2582005950281654
2018	0.27198617747733195
2019	0.306934407346159
2020	0.26853287282921473