Year	kg per 2015 US$ of GDP
1990	0.2558251579785915
1991	0.26506986664224325
1992	0.2601925845438162
1993	0.24450676689181194
1994	0.2541038364895905
1995	0.2536478484492865
1996	0.252675942008209
1997	0.2629052418207595
1998	0.26972257583527093
1999	0.2857499726758243
2000	0.2689205014903637
2001	0.28208932522244
2002	0.27747031682108253
2003	0.2813777680543869
2004	0.28418732642154676
2005	0.28317562257487255
2006	0.2712974978607083
2007	0.2695976556329672
2008	0.31728682292021815
2009	0.33006472416207555
2010	0.31260939098527923
2011	0.3224323987578937
2012	0.3128705634063983
2013	0.31095399843353566
2014	0.277114008373721
2015	0.26791805249108425
2016	0.26561168897159493
2017	0.2415680401607359
2018	0.2619894995737038
2019	0.2398538128520469
2020	0.2575149602764803