Year	constant 2015 US$
1975	601.5272276491106
1976	641.6600580263802
1977	571.6816712573913
1978	579.2581980962335
1979	497.38700225998815
1980	458.0553728497928
1981	446.3266195371554
1982	429.1181929720488
1983	431.06458415280224
1984	436.35095979519343
1985	441.73282488987866
1986	441.4517302863267
1987	515.3619864984357
1988	556.5575790874767
1989	555.6867507011214
1990	540.7039576563894
1991	559.8513344864834
1992	570.8503022736309
1993	563.770282088195
1994	353.95657004597723
1995	378.92237820650183
1996	391.8290169507856
1997	398.6529631700724
1998	408.8225268114688
1999	451.86145064973465
2000	488.0027023032251
2001	518.3842919113263
2002	542.6547429690969
2003	578.4093554513041
2004	627.0082133720068
2005	697.7467582281927
2006	759.6433949585665
2007	822.754086669665
2008	863.3869747708837
2009	851.2030242776701
2010	888.9125882943435
2011	938.0176770863025
2012	992.1346003854508
2013	1049.994506485576
2014	1109.3756527159571
2015	1170.742815786431
2016	1235.3234039444549
2017	1304.549389023619
2018	1384.9680228353102
2019	1465.9695353779746
2020	1404.1986549977344
2021	1429.9370268218386
2022	1488.814550841051
2023	1552.8205684853733