Year	US Dollars adjusted for inflation)
1991	6646.642
1992	6779.238
1993	6862.693
1994	6945.711
1995	7079.224
1996	7095.001
1997	7187.285
1998	7315.179
1999	7369.176
2000	7387.131
2001	7321.638
2002	7516.571
2003	7500.537
2004	7477.738
2005	7221.205
2006	7133.336
2007	7504.7
2008	7640.305
2009	7575.692
2010	7719.547
2011	7939.852
2012	7266.427
2013	7955.427
2014	7933.048
2015	8046.836
2016	8000.259
2017	8050.516
2018	8156.508
2019	8272.943
2020	8391.338
2021	8511.1
2022	8634.748