Year	constant 2010 US$
1968	3429.39493149804
1969	3722.09745902805
1970	4303.7249686262
1971	4701.7032803387
1972	5319.58351487934
1973	5790.34508236409
1974	6191.97669322697
1975	5875.20290839564
1976	6577.05391170739
1977	6598.19610435066
1978	6100.08342699758
1979	6188.66388081718
1980	5936.08859362805
1981	5829.98414564914
1982	5530.08302968158
1983	5208.89099593487
1984	4980.82117018045
1985	4792.74000707223
1986	4688.37849945818
1987	4554.94660351846
1988	4556.66469560863
1989	4553.58948411
1990	4973.38684126735
1991	5047.50951542096
1992	5194.90078471445
1993	5216.30232857819
1994	5235.33220488938
1995	5245.47237780483
1996	5382.50577616301
1997	5455.34572692303
1998	5594.9902797782
1999	5585.43015430989
2000	5796.96993268544
2001	5758.4685079264
2002	5742.1451268358
2003	5943.27243212417
2004	6296.55527712825
2005	6483.04981456313
2006	6733.32225712743
2007	6932.22771170049
2008	7088.63325285167
2009	6973.3876792247
2010	7172.82868411549
2011	7286.25965704389
2012	7417.75672114195
2013	7468.50807305543
2014	7540.37617165332
2015	7586.42482276539
2016	7809.72060285711
2017	7797.30699278651
2018	7845.80591435107