Year	kg per 2015 US$ of GDP
1990	0.9647063777857475
1991	1.01038161293195
1992	0.9935305561130554
1993	0.996148761914756
1994	0.9896985762569254
1995	0.9992984506228845
1996	0.9831359608171814
1997	1.0026904860246377
1998	0.9695645257753305
1999	0.9734165788978483
2000	0.9695222856320438
2001	0.948308988311775
2002	0.944667140369072
2003	0.9066465575491993
2004	0.9070488402716576
2005	0.8822229682924897
2006	0.8766496646143053
2007	0.89935156491533
2008	0.9199565410160095
2009	0.9398667377645383
2010	0.9243847383007657
2011	0.9305712797433496
2012	0.9545105009875563
2013	0.9278636005807355
2014	0.9431507035863325
2015	0.8904673704691476
2016	0.8497014315438793
2017	0.8427908354295993
2018	0.8368005448092387
2019	0.7938488582782353
2020	0.7611846100957239