Year	kg per PPP $ of GDP
1990	0.4450394948825078
1991	0.45128847090234847
1992	0.4339704221416846
1993	0.4249149432579402
1994	0.41309740720668287
1995	0.40829595103703503
1996	0.39417704392255276
1997	0.3951306043750947
1998	0.377600201957693
1999	0.37337201244978563
2000	0.3637430181424844
2001	0.3477582068563875
2002	0.3410779311858002
2003	0.32083501444775747
2004	0.31246229287972777
2005	0.2945378388939212
2006	0.28384828014772384
2007	0.2833845086757754
2008	0.2844812533968442
2009	0.28856212078986987
2010	0.2801295607725268
2011	0.2763001599222293
2012	0.27213253413119065
2013	0.2653516515350605
2014	0.27395290159357416
2015	0.26229101251180403
2016	0.2502053329954946
2017	0.24691352605907993
2018	0.23689945130810758
2019	0.21776512846615945
2020	0.20012332753660284