Year	US Dollars adjusted for inflation)
1990	3118.54659
1991	3049.01599
1992	2324.45298
1993	1760.55465
1994	1394.74421
1995	1216.07792
1996	1219.50935
1997	1277.85412
1998	1392.36119
1999	1482.32977
2000	1633.39444
2001	1781.2464
2002	1955.41315
2003	2158.00717
2004	2357.39603
2005	2949.44282
2006	3923.65815
2007	4851.17691
2008	5262.10136
2009	5639.00169
2010	5842.80578
2011	5770.9697
2012	5820.07985
2013	6078.32065
2014	6122.98049
2015	6117.03086
2016	5861.51196
2017	5805.13454