Year	US Dollars adjusted for inflation)
1987	2789.78187
1988	3020.56865
1989	2817.85675
1990	3713.35617
1991	3443.98162
1992	2845.45806
1993	2808.24853
1994	2263.55635
1995	2054.28249
1996	2151.27256
1997	1876.36776
1998	1983.01544
1999	2282.97592
2000	2381.17573
2001	2458.50768
2002	2440.27735
2003	2495.28836
2004	2593.51525
2005	2900.12255
2006	3181.07379
2007	3489.33006
2008	3949.04823
2009	4129.54353
2010	4439.203
2011	5006.29623
2012	5462.98055
2013	5909.77104
2014	6399.27066
2015	6693.93561
2016	6986.85594
2017	7317.54951