Year	kg per PPP $ of GDP
1990	0.878513790259111
1991	0.8160164381168076
1992	0.76018898502687
1993	0.7231452176648783
1994	0.6919519421684571
1995	0.6887434209943982
1996	0.6455872813446645
1997	0.6081852848163043
1998	0.5414311175219984
1999	0.50802222894336
2000	0.4832193655124992
2001	0.4675283059883152
2002	0.4480173491988711
2003	0.4621982836359967
2004	0.3905670547998884
2005	0.36157345965404597
2006	0.32920230929999017
2007	0.2986547290030376
2008	0.2870377490324416
2009	0.2687659647442928
2010	0.27177942939261707
2011	0.26492920306405376
2012	0.2575542564761538
2013	0.24444124663441438
2014	0.23176569427163546
2015	0.2150500790957833
2016	0.21038840533575004
2017	0.1971567200562823
2018	0.1882218139836153
2019	0.17358963365282318
2020	0.15528498333361745