Year	US Dollars adjusted for inflation)
1991	628.57
1992	594.873
1993	571.097
1994	547.242
1995	570.082
1996	577.612
1997	605.494
1998	609.027
1999	611.503
2000	614.352
2001	621.806
2002	639.941
2003	638.557
2004	654.344
2005	668.615
2006	682.753
2007	701.101
2008	710.27
2009	724.305
2010	744.956
2011	762.214
2012	773.855
2013	784.527
2014	799.598
2015	800.2
2016	799.18
2017	808.687
2018	823.484
2019	842.228
2020	863.19
2021	884.664
2022	908.487