Year	US Dollars adjusted for inflation)
1991	10655.277
1992	9274.148
1993	7796.42
1994	7715.218
1995	7805.125
1996	8241.324
1997	8356.723
1998	8251.613
1999	8701.336
2000	9055.286
2001	9140.603
2002	9113.971
2003	9264.358
2004	9648.649
2005	10508.87
2006	11526.278
2007	12105.536
2008	12390.958
2009	12275.597
2010	12703.971
2011	13103.845
2012	13497.284
2013	13814.112
2014	13863.822
2015	14424.124
2016	14643.27
2017	15046.622
2018	15424.002
2019	15848.672
2020	16328.858
2021	16857.732
2022	17409.383