Year	constant 2010 US$
1974	45632.2466663368
1975	43937.4687884357
1976	50735.5767258862
1977	54169.989767425
1978	55768.5377360157
1979	66019.8751942031
1980	59413.3946135826
1981	46170.9932631625
1982	46590.0176345573
1983	45496.4992969116
1984	44489.9551564721
1985	42601.6376823434
1986	40284.2803244734
1987	39943.6728806368
1988	39251.6875894504
1989	37740.7782163524
1990	37080.905766838
1991	37171.4749076551
1992	37848.1292503919
1993	36913.6461243111
1994	37052.2679690634
1995	37713.6899412144
1996	37842.9279965812
1997	36409.3719864638
1998	35390.7901840577
1999	35680.9788660012
2000	35931.5965013377
2001	36171.8050676004
2002	36841.2942129897
2003	37212.4669053931
2004	36761.2498220737
2005	36329.4982777345
2006	37399.74000641
2007	36987.8415885984
2008	35844.4160068892
2009	34800.5635264382
2010	35269.5531076448
2011	36121.891977592
2012	35967.3283979567
2013	34729.8266256897
2014	33471.1464519954
2015	32869.2866185522
2016	31685.2254544178
2017	31752.7874645235
2018	31436.9485949026