Year	kg per PPP $ of GDP
1990	5.1673107733411685
1991	4.932872662610064
1992	3.838652472318398
1993	3.2181241058125747
1994	0.6689723071819157
1995	0.6019562176633582
1996	0.47648769252588064
1997	0.6951783619968913
1998	0.7468999790079605
1999	0.6571648921873101
2000	0.8089564707224336
2001	0.7645880629861163
2002	0.7309172722425674
2003	0.7236949379543463
2004	0.6953253049465292
2005	0.6650354657670047
2006	0.6415608659356626
2007	0.6123032877764161
2008	0.6125002965230524
2009	0.6104471387894733
2010	0.6018217691221676
2011	0.6499424821181718
2012	0.591220863890543
2013	0.5598379632091961
2014	0.49001344393745466
2015	0.4709919744625752
2016	0.4990550849257147
2017	0.48573145793954003
2018	0.44941614849098516
2019	0.3843502448089779
2020	0.38784721942332584