Year	US Dollars adjusted for inflation)
1991	517.102
1992	457.761
1993	477.569
1994	483.339
1995	472.47
1996	588.155
1997	633.451
1998	684.506
1999	712.013
2000	698.161
2001	769.348
2002	810.683
2003	837.123
2004	881.401
2005	936.03
2006	1007.45
2007	1058.477
2008	1108.544
2009	1156.748
2010	1213.487
2011	1282.126
2012	1358.221
2013	1425.429
2014	1527.443
2015	1578.834
2016	1587.671
2017	1599.243
2018	1629.797
2019	1678.905
2020	1745.94
2021	1812.435
2022	1936.987