Year	constant 2010 US$
1971	595.864277487828
1972	625.084882807493
1973	649.224632659742
1974	647.298783240523
1975	595.553253140617
1976	572.19160949657
1977	585.130323466187
1978	575.076916206548
1979	619.120077578683
1980	669.27135444688
1981	684.308529510974
1982	696.433999807249
1983	594.427503044261
1984	587.599277950131
1985	592.920378915777
1986	596.809113699918
1987	557.222978143169
1988	567.636431837655
1989	516.15823111441
1990	565.20252024303
1991	578.421989439572
1992	549.930056234129
1993	565.116202107114
1994	525.444466805631
1995	560.093730697047
1996	559.694355259631
1997	575.861595616895
1998	572.452750975794
1999	540.486028244983
2000	568.058641900662
2001	579.679770191074
2002	601.326814852053
2003	611.063084235555
2004	628.17079021832
2005	614.013642966719
2006	613.99503833262
2007	627.929809000155
2008	647.047935782313
2009	646.093347314399
2010	637.332425990881
2011	641.274123997635
2012	655.564039819774
2013	695.000565323799
2014	720.472191371061
2015	708.63054862286
2016	690.977959423229
2017	695.37360402724