Year	constant 2015 US$
1991	3500.3669988628344
1992	3556.1715620577615
1993	3771.568707525725
1994	3580.6152781909436
1995	3650.7098813933603
1996	3588.8640069607804
1997	3542.8960779268846
1998	3556.1289381253173
1999	3343.1998769510883
2000	3324.225970117928
2001	3288.041190099039
2002	3232.094652403865
2003	3154.627021716493
2004	3230.231886418452
2005	3052.9921443345834
2006	3179.5329478751537
2007	3234.3469583801957
2008	2964.169523905816
2009	2890.6640430423136
2010	2810.5621225139016
2011	2830.1575600646615
2012	2808.9467195070188
2013	2782.579931100872
2014	2663.864247764493
2015	2501.1498046974084
2016	2319.3343344932764
2017	2423.9597482892873
2018	2506.5266080238134
2019	2529.29620313
2020	2370.667509215674
2021	2337.2128777464814
2022	2349.1774307001083