Year	constant 2015 US$
1967	737.8963098501632
1968	774.5797791197679
1969	810.9935375908212
1970	821.6890580943904
1971	844.5833075630505
1972	857.2570304639257
1973	830.5350670167776
1974	902.2743304629039
1975	997.8242712070553
1976	915.1189830122072
1977	895.3301413139134
1978	1234.844238776301
1979	1308.959527643362
1980	1117.3085903601207
1981	1347.4745343314257
1982	1455.5173648921837
1983	1533.2888482407145
1984	1637.881156471585
1985	1722.8638303295047
1986	1811.3031933794864
1987	1718.5783830586067
1988	1549.6112236872568
1989	1458.6015888366305
1990	1301.7801532943968
1991	1192.3765118219821
1992	1134.5987659072268
1993	1018.2032528828624
1994	1001.1489410499727
1995	1000.3188727778698
1996	1013.8339836315305
1997	1029.3661476439027
1998	1061.5564865303747
1999	1084.0227103879981
2000	1075.9182135092728
2001	1086.4504848425659
2002	1116.3351275247387
2003	1169.4463403968673
2004	1231.3980257215756
2005	1219.9156085683082
2006	1248.0977104158962
2007	1255.5846244922564
2008	1262.600950345522
2009	1272.0572422708271
2010	1265.1973682631924
2011	1271.0687277203629
2012	1286.529454885228
2013	1308.2432139378
2014	1340.9935641043407
2015	1380.690151080516
2016	1396.531474157562
2017	1402.8978823027062
2018	1418.2484664572214
2019	1423.0077571246475
2020	1388.4661841705315
2021	1405.029644815939
2022	1404.3699422947536
2023	1429.5810539648228