Year	US Dollars adjusted for inflation)
1990	3853.92191
1991	3621.41349
1992	3391.56046
1993	3145.56069
1994	3093.8821
1995	3057.00423
1996	3083.60699
1997	3112.12313
1998	3197.35324
1999	3315.75661
2000	3448.83445
2001	3329.92083
2002	3369.63205
2003	3436.9676
2004	3591.29333
2005	3755.03659
2006	3942.43613
2007	4192.94849
2008	4418.26743
2009	4398.7738
2010	4542.9041
2011	4645.515
2012	4620.63732
2013	4751.90141
2014	4920.21606
2015	5104.77739
2016	5249.22383
2017	5245.35961