Year	constant 2010 US$
1977	72558177.0696471
1978	80550757.7293052
1979	53633298.8215639
1980	52527669.736779
1981	62971332.7379816
1982	64047611.169515
1983	64123159.320669
1984	68067837.2640639
1985	64451207.05375
1986	75780637.925037
1987	78776376.660298
1988	83952857.3870987
1989	70740349.3721159
1990	77076804.8595593
1991	76508279.0851323
1992	77910739.6754161
1993	77811557.2426514
1994	74193969.8431451
1995	67483045.0458886
1996	71439427.0411245
1997	69972524.1082824
1998	68320218.2468914
1999	66476527.0244987
2000	65683959.6795013
2001	62124622.2801901
2002	60641871.1490967
2003	57499519.7872185
2004	57561548.1658047
2005	57351585.7777139
2006	58064964.6089326
2007	53469197.0259691
2008	60687788.9420434
2009	61738492.9996173
2010	56623631.8518518
2011	60762649.1134653
2012	65516066.491101
2013	68513987.6597027
2014	68409917.4746694
2015	66500915.4074634
2016	72639394.8874868
2017	58731301.0548585
2018	51940596.8474249