Year	constant 2015 US$
1991	2630.86784780166
1992	2655.994398952253
1993	2665.0154426569047
1994	2709.232513071897
1995	2880.8097377526296
1996	2903.319917271747
1997	3065.411227022972
1998	3235.4916768452226
1999	3200.554610805016
2000	3027.390312120616
2001	3085.579039182147
2002	3081.9097345460605
2003	3169.1381246574647
2004	3239.110842512997
2005	3265.7288750734087
2006	3322.8631269126313
2007	3395.2531625722654
2008	3399.1705891345537
2009	3390.9671762541684
2010	3534.3839479183175
2011	3731.07460766532
2012	3936.1349251198358
2013	4200.500937956721
2014	4450.540457636392
2015	4590.888138963226
2016	4532.145369331548
2017	4368.865103458886
2018	4211.149392570312
2019	4295.919415329518
2020	4151.412469701804
2021	4072.308570907117
2022	3874.1706718456385