Year	constant 2015 US$
1970	11808.506457858055
1971	12187.585119727915
1972	13184.731395039542
1973	13825.735631022962
1974	12847.5826564382
1975	13324.112928431025
1976	13421.351331379274
1977	13921.890056728684
1978	14463.15917987221
1979	14334.449394776473
1980	13976.440062609341
1981	14196.578271895261
1982	14234.416139524106
1983	14176.303213781383
1984	14337.573738856867
1985	14583.88597362727
1986	14981.070052769881
1987	15432.646660441713
1988	15977.353640339383
1989	16852.75671678668
1990	17962.084813559355
1991	17929.304869781987
1992	18020.451718837085
1993	18794.17659074895
1994	19647.009896171254
1995	21086.659569127867
1996	22476.30111509505
1997	24377.263656273135
1998	26389.95769361447
1999	27728.024214183348
2000	30079.116957610535
2001	30803.75192234969
2002	31377.11985464651
2003	32417.39471504617
2004	32704.84906179045
2005	33742.26177938836
2006	34260.1719455635
2007	34628.911757450165
2008	32650.20035568786
2009	29431.351530658303
2010	29721.314257172467
2011	29185.977351105288
2012	28943.748642642924
2013	30609.352219944165
2014	32777.06461126452
2015	34222.82991613407
2016	35733.15809907135
2017	36360.76574120614
2018	37290.13128124785
2019	38641.75731448292
2020	36121.903337209056
2021	42024.464501221606