Year	US Dollars adjusted for inflation)
1991	4474.268
1992	4589.394
1993	4772.917
1994	5012.482
1995	5297.096
1996	5583.673
1997	5737.325
1998	4844.459
1999	4760.554
2000	4875.481
2001	4952.985
2002	5115.508
2003	5269.144
2004	5485.392
2005	5778.962
2006	5976.868
2007	6281.161
2008	6491.99
2009	6587.846
2010	6838.002
2011	7122.257
2012	7402.49
2013	7710.311
2014	7979.245
2015	8441.669
2016	8631.727
2017	8988.56
2018	9387.67
2019	9806.787
2020	10256.849
2021	10738.811
2022	11231.815