Year	kg per PPP $ of GDP
1990	0.9775803976435111
1991	0.9248342896653471
1992	0.8731788059901999
1993	0.8294851533280934
1994	0.7745617177451909
1995	0.7626645942359227
1996	0.7116614648514682
1997	0.6686825461739773
1998	0.6694338426346744
1999	0.6322376381370972
2000	0.6093009352450175
2001	0.5947253387507122
2002	0.5817989635036606
2003	0.5937196571580166
2004	0.5856896171333107
2005	0.5734584077071722
2006	0.5493544686159715
2007	0.5202365761680907
2008	0.4928692392110614
2009	0.48458847972585356
2010	0.4784891369243585
2011	0.4716810351783403
2012	0.45264648098851934
2013	0.43992124774115876
2014	0.42262573856041274
2015	0.4099312268206547
2016	0.3916226259074273
2017	0.37746060433916717
2018	0.36532082862266807
2019	0.3504599861671901
2020	0.34288971359902504