Year	constant 2015 US$
1970	381.25690008838586
1971	378.35438427914437
1972	369.2180883672266
1973	388.0433440388797
1974	354.7966513434691
1975	364.95202181722806
1976	381.54026772484184
1977	390.8618266800002
1978	409.18616371905006
1979	388.7295780223329
1980	418.7224100228972
1981	406.55084419832224
1982	402.4092031308674
1983	433.0021966688015
1984	430.38751634602727
1985	435.7795129527889
1986	443.2697043168001
1987	461.1879419615906
1988	484.9582597935287
1989	498.83665624756264
1990	520.9864331826196
1991	509.96432094146354
1992	521.8312413456403
1993	548.9928313702738
1994	565.4442850334617
1995	581.2285708554289
1996	626.6776755205824
1997	631.0259573017084
1998	658.6120190166278
1999	665.0013317541506
2000	662.6852067569333
2001	660.2025761716792
2002	675.9952519141606
2003	719.8231672088771
2004	768.0755336692242
2005	817.7296254448192
2006	869.5554466160263
2007	918.8607134495967
2008	931.7566153213655
2009	1005.7895865920036
2010	1076.6023942941786
2011	1115.1827497307238
2012	1156.0079752824488
2013	1207.869595371564
2014	1266.0801664694195
2015	1354.6570486516719
2016	1453.8359943338037
2017	1550.9751804116565
2018	1625.1331685769085
2019	1665.1565661957468
2020	1563.3122595510663
2021	1695.591848414879