Year	US Dollars adjusted for inflation)
1981	206029896.19845
1982	215798320.40306
1983	220076312.16126
1984	223902101.07931
1985	238586638.56188
1986	243641480.3011
1987	250915732.40366
1988	246193819.37012
1989	247153745.83692
1990	242101697.2882
1991	257632375.4774
1992	258281571.75246
1993	267936259.20025
1994	281205874.18538
1995	291643880.05533
1996	291673674.08728
1997	291289879.91259
1998	299209506.02954
1999	310823935.13132
2000	321298203.47436
2001	332870685.71538
2002	344251123.85902
2003	351509939.90885
2004	350274663.66325
2005	355816598.62213
2006	352926577.52326
2007	338224447.8409
2008	348707781.80222
2009	356695326.5512
2010	369485198.81798
2011	379775900.64182
2012	383157131.24108
2013	371200315.78862
2014	378893840.48549
2015	392957799.64474
2016	406237705.3317
2017	417206123.37566