Year	constant 2010 US$
1970	3603.37593636828
1971	3900.91653486567
1972	3801.89425373427
1973	4397.34988208736
1974	4898.60044022525
1975	5644.29694466059
1976	8743.73082826473
1977	6889.95134224357
1978	4692.48043766043
1979	2968.82303667281
1980	6677.27534006197
1981	9263.77560323358
1982	8946.98047141595
1983	8399.88893917189
1984	7698.20949296171
1985	6238.88726645016
1986	5204.97909602834
1987	3580.03141965874
1988	4841.18088761907
1989	4173.14225332031
1990	3674.02659117743
1991	4490.62301383052
1992	3708.88257840341
1993	3262.58347381117
1994	3795.02442291906
1995	3635.31071332275
1996	3490.93667529836
1997	3960.21430923026
1998	4488.12702789049
1999	4040.10884850903
2000	3603.89122215103
2001	4332.23444218079
2002	4766.08401214377
2003	4601.00944908594
2004	4140.41488428366
2005	4555.95990184337
2006	4341.03057139136
2007	4202.05389331209
2008	4177.55884788256
2009	4393.13418264316
2010	4586.30319837672
2011	5016.22455452662
2012	5571.20181944263
2013	5711.38686953636
2014	6090.33107350178
2015	6316.28013729089
2016	6207.70163372459
2017	6192.364360207