Year	constant 2015 US$
1991	941.0022376585555
1992	945.3907934169858
1993	956.5285215872784
1994	935.5779584521707
1995	937.1667845176084
1996	972.7160869129053
1997	980.965956732895
1998	1005.5980537944562
1999	1038.0060034424084
2000	1000.3919060349708
2001	1017.593887131198
2002	1180.126901222402
2003	1196.1369718117164
2004	1193.3334934327252
2005	1257.1846499948049
2006	1303.0538732822265
2007	1308.2866667244314
2008	1340.5043949094236
2009	1370.8039477941973
2010	1432.2923718558566
2011	1447.0513696959351
2012	1489.775851415126
2013	1510.6591522637752
2014	1554.823796689208
2015	1550.5024037661392
2016	1586.087205301154
2017	1609.4818117157542
2018	1625.3829532896173
2019	1648.7193992251825
2020	1667.8929640744964
2021	1638.0676626049928
2022	1606.8235657817302