Year	US Dollars adjusted for inflation)
1970	15656.4729
1971	17401.31882
1972	18055.46181
1973	19008.82791
1974	19890.55506
1975	19978.73473
1976	21126.71501
1977	23130.19933
1978	24621.56044
1979	25610.10316
1980	27499.38348
1981	27248.09862
1982	25790.9724
1983	26375.33672
1984	24724.46102
1985	25387.61404
1986	27036.99071
1987	28211.92116
1988	29412.24234
1989	31087.32042
1990	27295.95234
1991	27314.10719
1992	26011.62756
1993	24748.53368
1994	26073.0271
1995	26899.80186
1996	27262.4139
1997	27613.4807
1998	29702.68897
1999	30111.9577
2000	32193.00252
2001	32514.75985
2002	32051.66566
2003	33380.20993
2004	35645.60107
2005	37352.89254
2006	39539.91571
2007	40626.78143
2008	43305.70276
2009	43684.5872
2010	43988.33249
2011	43781.46256
2012	44454.37355
2013	43954.02161
2014	46443.76342
2015	46738.06226
2016	50255.117