Year	US Dollars adjusted for inflation)
1991	422.281
1992	455.178
1993	473.975
1994	500.395
1995	525.053
1996	548.034
1997	567.318
1998	588.633
1999	642.22
2000	720.363
2001	793.028
2002	879.786
2003	994.151
2004	1121.987
2005	1267.773
2006	1430.017
2007	1597.088
2008	1754.359
2009	1932.828
2010	2110.19
2011	2206.207
2012	2346.798
2013	2522.448
2014	2698.154
2015	2864.961
2016	3017.802
2017	3214.853
2018	3442.486
2019	3686.917
2020	3929.476
2021	4162.791
2022	4394.724