Year	US Dollars adjusted for inflation)
1991	50255.398
1992	48248.957
1993	45891.137
1994	46639.793
1995	46014.922
1996	47548.379
1997	46816.27
1998	47025.77
1999	49313.656
2000	50299.18
2001	49805.016
2002	50744.156
2003	49540.762
2004	48082.734
2005	48160.211
2006	46731.09
2007	46316.457
2008	44183.234
2009	44100.117
2010	43561.914
2011	43097.219
2012	43254.559
2013	43501.598
2014	41346.434
2015	39253.188
2016	39149.918
2017	39194.621
2018	39495.094
2019	39830.152
2020	40012.844
2021	39947.973
2022	40107.93