Year	kg per 2015 US$ of GDP
1990	0.6878558072718199
1991	0.7348345448080829
1992	0.7263629094348677
1993	0.801598164714274
1994	0.8244140224357893
1995	0.8248129208901327
1996	0.7890479165072195
1997	0.763129870194709
1998	0.7282049179628395
1999	0.7326233046064199
2000	0.72894699371529
2001	0.6953262534953174
2002	0.6912322832220149
2003	0.6946058816958586
2004	0.6745215842843075
2005	0.6735382783828477
2006	0.6936184772508454
2007	0.6925900776932197
2008	0.708547328599266
2009	0.7289109077460203
2010	0.7079713538075035
2011	0.7271154090696487
2012	0.7932549414715445
2013	0.7965874851415833
2014	0.8131611881580552
2015	0.8334833133177694
2016	0.7938883192840359
2017	0.7975816997494353
2018	0.8206336764395528
2019	0.8432113998794566
2020	0.8406603272622724