Year	US Dollars adjusted for inflation)
1991	8129.128
1992	7304.396
1993	5305.343
1994	5344.702
1995	5765.606
1996	6233.347
1997	6511.171
1998	6744.072
1999	6739.423
2000	6721.138
2001	6783.173
2002	6131.635
2003	6179.969
2004	6627.787
2005	7354.828
2006	8328.698
2007	9585.795
2008	10231.203
2009	9799.589
2010	9525.9
2011	9320.038
2012	9454.292
2013	9741.571
2014	9840.237
2015	9774.124
2016	9427.947
2017	9233.454
2018	9152.966
2019	9122.141
2020	9136.429
2021	9045.266
2022	9029.694