Year	US Dollars adjusted for inflation)
1991	20790.518
1992	20277.613
1993	20546.779
1994	21048.924
1995	21317.361
1996	21368.105
1997	21687.533
1998	21437.787
1999	21111.076
2000	21431.145
2001	21075.008
2002	20952.85
2003	20885.275
2004	21224.707
2005	21526.092
2006	21678.438
2007	22664.52
2008	23269.855
2009	22994.549
2010	24477.934
2011	25346.818
2012	25683.02
2013	26042.648
2014	25808.92
2015	24895.77
2016	24642.029
2017	25240.279
2018	25333.973
2019	25900.645
2020	26556.971
2021	27136.535
2022	27696.332