Year	constant 2015 US$
1970	1753.0200801240762
1971	1680.7447420277113
1972	1849.918229075814
1973	2200.1182334052523
1974	3178.213514156897
1975	3363.410739544139
1976	2477.9918818942942
1977	2380.108559164219
1978	2422.6808557076256
1979	2130.904691414166
1980	1748.7729967840598
1981	1812.9361967099012
1982	1769.6463043122985
1983	1567.6741993330254
1984	1750.293286688813
1985	1485.0394796116489
1986	1419.1365835362453
1987	1405.8788456978864
1988	1666.5673244827046
1989	1507.688374120678
1990	1386.546199073272
1991	1283.5535130421392
1992	1561.5304221148483
1993	1537.9968064578256
1994	1542.7840253091965
1995	1564.439272114541
1996	1538.923077206453
1997	1529.2605691116373
1998	1562.0043483935729
1999	1477.0349077279373
2000	1549.882269129062
2001	1472.4168654843202
2002	1466.2836238464236
2003	1413.5370538181692
2004	1377.7327837588489
2005	1365.3455759128651
2006	1419.2251793626804
2007	1435.4279967710368
2008	1366.2188948902058
2009	1346.9255961631068
2010	1335.4835799842924
2011	1359.0886792115323
2012	1416.1279959383291
2013	1497.8242578976146
2014	1495.0228297681015
2015	1641.480977397431
2016	1733.245684940578
2017	1767.1380045766757
2018	1799.2686396672116
2019	1829.22305681577
2020	1785.5631929682918
2021	1904.7658831151816
2022	1942.6980664954403
2023	1991.314313998969