Year	US Dollars adjusted for inflation)
1991	12253.382
1992	12315.77
1993	12379.694
1994	12369.45
1995	12650.785
1996	12831.041
1997	12978.005
1998	13050.7
1999	13197.888
2000	13218.304
2001	13226.645
2002	13744.433
2003	14223.041
2004	14649.791
2005	15422.183
2006	16123.549
2007	16532.52
2008	16107.162
2009	15814.07
2010	15824.168
2011	15573.38
2012	15723.428
2013	16197.341
2014	16250.248
2015	15868.779
2016	14962.346
2017	14959.31
2018	14701.548
2019	14474.323
2020	14353.315
2021	14330.636
2022	14407.979