Year	constant 2015 US$
1991	4291.621957542384
1992	4324.029072917562
1993	4322.040978103749
1994	4366.383793035117
1995	4415.210398467687
1996	4458.680818361069
1997	4492.858537700479
1998	4544.206755866396
1999	4649.593572273794
2000	4677.658162634919
2001	4785.685981887406
2002	4821.889330756053
2003	4861.891625966608
2004	5059.650772871479
2005	5218.793567682853
2006	5375.430107294854
2007	5645.563614865542
2008	5931.92396372291
2009	6195.900522097921
2010	6357.125968415008
2011	6485.59805146227
2012	6717.843514824115
2013	6908.062623163872
2014	7143.730478103946
2015	7320.804831445513
2016	7491.911228158994
2017	7607.311071578009
2018	7739.2163001996905
2019	7884.901941903923
2020	7820.8536676008225
2021	8030.262502107786
2022	8305.534886734335