Year	US Dollars adjusted for inflation)
1991	8047.911
1992	8375.743
1993	8446.548
1994	8709.051
1995	8729.965
1996	9091.994
1997	8857.57
1998	8955.951
1999	9751.053
2000	9592.119
2001	9667.536
2002	9891.211
2003	9915.612
2004	9956.274
2005	9912.795
2006	10311.407
2007	10418.982
2008	10303.334
2009	9882.419
2010	9951.246
2011	10047.793
2012	10057.925
2013	10335.676
2014	10572.504
2015	11013.823
2016	11040.311
2017	11400.762
2018	11798.838
2019	12249.016
2020	12800.214
2021	13356.114
2022	13853.896