Year	US Dollars adjusted for inflation)
1991	14011.984
1992	14158.034
1993	13833.842
1994	14141.655
1995	14373.317
1996	14602.141
1997	14576.425
1998	14571.164
1999	14282.038
2000	14447.186
2001	13234.646
2002	13174.382
2003	12995.549
2004	13151.704
2005	13030.141
2006	13588.291
2007	13828.8
2008	13886.02
2009	13819.068
2010	13811.524
2011	14197.317
2012	14293.961
2013	14703.324
2014	15045.483
2015	15184.679
2016	15354.037
2017	15560.178
2018	15810.485
2019	16215.647
2020	16610.957
2021	17034.105
2022	17464.23