Year	constant 2015 US$
1960	524.173319640447
1961	563.7394211078274
1962	681.4023548204534
1963	603.9056812474123
1964	639.9068631348969
1965	634.4270936421763
1966	567.490014056455
1967	594.8900983558405
1968	597.3065644429199
1969	686.3493319063775
1970	651.848605301731
1971	686.4032475179329
1972	833.227231921269
1973	721.0025552294409
1974	876.7213693768592
1975	985.7607188983885
1976	1069.2577898966842
1977	1014.6239352846069
1978	1077.7972993549006
1979	1050.6371360539656
1980	1162.7496865097644
1981	1211.4475699094062
1982	1205.0250318667188
1983	1192.2800327500681
1984	1063.9307639980889
1985	1123.9273133479796
1986	999.7628708269044
1987	982.9253389404837
1988	1122.4828085444756
1989	938.9830628091745
1990	944.667569631768
1991	987.3878008805193
1992	1083.7589707459904
1993	1118.07073769964
1994	1165.5208442112416
1995	1213.3568972127412
1996	1296.7515527911175
1997	1326.2708876754734
1998	1380.0305639974404
1999	1297.4551656786468
2000	1273.66498240518
2001	1254.6676068807758
2002	1271.1505761322094
2003	1328.1159496360706
2004	1382.6869056697128
2005	1429.1435187287302
2006	1435.7119442774851
2007	1424.040064938188
2008	1434.368656074718
2009	1494.5892260765047
2010	1536.2673698878218
2011	1552.7211333915855
2012	1150.0820301164465
2013	891.3686359347039
2014	856.166233920089
2015	857.4178847606876
2016	812.690278508957
2017	805.9995762949937
2018	802.4302093553745
2019	781.3183334693907
2020	754.5759392650825
2021	744.6048848680467