Year	constant 2015 US$
1980	751.5317293990147
1981	715.767406727182
1982	689.3370786550553
1983	625.1146150555904
1984	598.2681853518185
1985	544.1106243683867
1986	518.2050452207459
1987	567.3693632522762
1988	474.4622451172231
1989	500.9843457670837
1990	404.43453492870555
1991	398.11040989213865
1992	365.1265111722155
1993	386.5997156359515
1994	313.6412697074967
1995	386.3703180548764
1996	404.95795950549643
1997	332.3648762236853
1998	318.7013498429225
1999	297.6416692615791
2000	295.6139009283485
2001	359.209692369295
2002	417.97137930945024
2003	428.4695570574659
2004	430.8606504710079
2005	425.86592970165117
2006	420.7370388403833
2007	451.8676915669648
2008	480.06113849115053
2009	497.8220971310952
2010	424.0213316874396
2011	530.136193794825
2012	577.0855288849762
2013	737.1329352236287
2014	610.2284782389738
2015	594.5756180949122
2016	642.1225380812891
2017	624.9209154135268
2018	568.9406918989994
2019	554.1640575241306
2020	570.992109349944
2021	832.9481514358519
2022	875.5769388368448
2023	890.4223057250401