Year	US Dollars adjusted for inflation)
1991	17386.379
1992	18283.916
1993	18650.07
1994	19598.209
1995	19106.979
1996	20414.877
1997	21824.012
1998	22184.818
1999	21920.096
2000	21835.41
2001	20950.213
2002	19971.4
2003	20201.094
2004	20292.457
2005	21541.104
2006	21475.725
2007	22329.889
2008	23228.469
2009	23772.012
2010	25338.582
2011	26088.814
2012	27082.07
2013	28381.998
2014	28936.363
2015	29352.699
2016	29845.359
2017	30464.67
2018	31301.518
2019	32225.682
2020	33120.414
2021	34062.453
2022	34993.195