Year	constant 2015 US$
1970	74708.79994642398
1971	72868.22824148156
1972	72624.6877982055
1973	72891.75004216556
1974	70516.73371360573
1975	68635.69901631598
1976	68745.31597465478
1977	59182.71761182788
1978	60078.75911108726
1979	59153.93528480755
1980	54947.71906896559
1981	52164.38858525939
1982	45824.56020788607
1983	42558.62209700909
1984	42265.889478075034
1985	39376.64344920744
1986	39691.99766458753
1987	38204.66414835738
1988	39012.317148175185
1989	40007.54223046505
1990	39989.172506861825
1991	38048.55053081943
1992	41028.80403365576
1993	39256.6718450154
1994	38649.29826420644
1995	38466.423086106974
1996	39076.88676258328
1997	48836.84455955808
1998	51473.1139683519
1999	50850.812963798504
2000	52157.763347549546
2001	51565.047554859084
2002	52606.17816480322
2003	51987.099290945764
2004	59634.73377358496
2005	58757.99266873258
2006	61985.69923171285
2007	60261.431747857474
2008	60478.903517535306
2009	60730.124776939665
2010	68253.0658889652
2011	73493.26895442363
2012	72870.3737957496
2013	72012.54955106671
2014	69723.72737480364
2015	66984.91020023957
2016	64233.26221497357
2017	60551.02004488254
2018	60080.69655111699
2019	59621.38164426118
2020	58476.199431953304
2021	61022.5028952733
2022	63428.364094817836