Year	US Dollars adjusted for inflation)
1991	13703.728
1992	14534.511
1993	14918.318
1994	15025.928
1995	15096.717
1996	15482.111
1997	15185.004
1998	15298.404
1999	15622.575
2000	15942.25
2001	15681.798
2002	15873.672
2003	16126.683
2004	16725.145
2005	16403.324
2006	17130.924
2007	17663.957
2008	18261.307
2009	18467.564
2010	19720.691
2011	20016.486
2012	20722.002
2013	20548.344
2014	20533.965
2015	21462.889
2016	23010.918
2017	23233.373
2018	23745.863
2019	24334.779
2020	24992.209
2021	25694.004
2022	26413.973