Year	US Dollars adjusted for inflation)
1991	8201.229
1992	7397.246
1993	6334.51
1994	4880.475
1995	4290.971
1996	3997.422
1997	3996.386
1998	4099.947
1999	4186.854
2000	4386.616
2001	4849.21
2002	5057.945
2003	5532.503
2004	6214.376
2005	6318.235
2006	6786.354
2007	7320.608
2008	7520.329
2009	6598.565
2010	6844.74
2011	7220.171
2012	7301.877
2013	7237.99
2014	7132.765
2015	6444.348
2016	6669.753
2017	6912.888
2018	7156.758
2019	7446.509
2020	7718.786
2021	8023.593
2022	8329.46