Year	kg per 2015 US$ of GDP
1990	1.4983914647447756
1991	1.4764856939792417
1992	1.39711380009961
1993	1.3746295664467392
1994	1.3037481772075572
1995	1.3263895445469533
1996	1.2277075144431975
1997	1.1791624006944883
1998	1.1722707147431262
1999	1.088231751549823
2000	1.0660331349083416
2001	1.0510098830398782
2002	1.0408620730180809
2003	1.0964768708579182
2004	1.1467104961729493
2005	1.1710692956731434
2006	1.1543634841356643
2007	1.1109319228491727
2008	1.0521426949920276
2009	1.0360726544850365
2010	1.0331318853919225
2011	1.0377206065656253
2012	0.9915199719485921
2013	0.9629999177937204
2014	0.9094476355118961
2015	0.8438510104994209
2016	0.7943287193345824
2017	0.7635626071627528
2018	0.754676133145972
2019	0.731958084818854
2020	0.7303475168140526