Year	US Dollars adjusted for inflation)
1991	18107.188
1992	18388.076
1993	17797.633
1994	17173.914
1995	17192.77
1996	17722.824
1997	17367.244
1998	17071.365
1999	16768.633
2000	17033.098
2001	16758.939
2002	16957.219
2003	17184.684
2004	16799.174
2005	16979.047
2006	17747.576
2007	19244.646
2008	20001.75
2009	20236.053
2010	21959.168
2011	22381.621
2012	20802.609
2013	19935.352
2014	20781.838
2015	19808.105
2016	21789.234
2017	22323.754
2018	23091.756
2019	23927.211
2020	24814.07
2021	25833.174
2022	26907.816