Year	kg per 2011 PPP $ of GDP
1990	1.27777253486526
1991	1.23840277717832
1992	1.26620591244163
1993	1.19614741997613
1994	1.12077825838636
1995	1.05376594726997
1996	1.18976045231538
1997	0.988476867036117
1998	0.95047112100623
1999	1.03727743437503
2000	1.02602515528301
2001	1.08890245500917
2002	1.09558244432917
2003	1.06993261196319
2004	1.03590434244201
2005	1.11303027246639
2006	1.09978462283884
2007	1.11870225367641
2008	1.05608989837205
2009	1.11728600730656
2010	1.15457087391203
2011	1.13379580934972
2012	1.08319401835859
2013	1.08812681356792
2014	1.09246171211804