Year	current US$
1973	90687171.9760771
1974	103780313.837375
1975	152581616.114841
1976	148192771.084337
1977	178978845.940857
1978	292876614.910513
1979	283878075.651855
1980	274719862.08595
1981	187423210.097174
1982	172145902.415917
1983	167943479.741233
1984	157563322.484788
1985	150951079.052993
1986	144753103.0036
1987	182052791.234663
1988	250068324.678874
1989	322014857.764088
1990	378371321.778006
1991	374558555.987586
1992	308772541.83665
1993	268715362.950849
1994	316411794.331761
1995	207061771.69141
1996	222394160.10713
1997	248091916.906873
1998	194246071.310185
1999	223881689.163289
2000	214836674.851118
2001	236862071.019276
2002	360403112.542105
2003	342791902.917105
2004	425835361.094532
2005	555989231.475977
2006	708419384.840475
2007	939564598.631154
2008	1145828196.44086
2009	1396655606.23631
2010	1462593382.67103
2011	849379220.588376
2012	726396952.702865
2013	701033513.873076
2014	724864314.262462
2015	778910112.332563
2016	585696930.522768
2017	846672085.694039