Year	kg per 2015 US$ of GDP
1990	1.3266074208101617
1991	1.3116563158430379
1992	1.2571133190098074
1993	1.203918583545085
1994	1.1366029754316271
1995	1.1368908890809897
1996	1.0793054111407423
1997	1.036701103627019
1998	1.0171101349004839
1999	0.9851526576536073
2000	0.9728780950085498
2001	0.968593916325453
2002	0.9591686062985723
2003	0.9811688075816347
2004	0.9865553695678898
2005	0.9863252947231866
2006	0.9737741299839715
2007	0.9497960495646535
2008	0.9244815002645942
2009	0.9119253111494231
2010	0.9064796704666569
2011	0.9097790761613055
2012	0.8878471868594044
2013	0.865197302956989
2014	0.8351387405699522
2015	0.7900165490323228
2016	0.75930848830902
2017	0.741213860702623
2018	0.7345215166862006
2019	0.7157324188248521
2020	0.7085372800844769