Year	US Dollars adjusted for inflation)
1991	935.237
1992	991.32
1993	1045.415
1994	1110.731
1995	1187.832
1996	1269.624
1997	1353.3
1998	1386.932
1999	1417.663
2000	1478.535
2001	1538.348
2002	1589.166
2003	1667.032
2004	1755.14
2005	1850.255
2006	1945.035
2007	2045.879
2008	2120.667
2009	2198.844
2010	2292.572
2011	2373.552
2012	2444.839
2013	2535.88
2014	2640.234
2015	2794.417
2016	2946.554
2017	3108.479
2018	3284.962
2019	3468.187
2020	3655.323
2021	3852.494
2022	4054.05