Year	US Dollars adjusted for inflation)
1991	11651.998
1992	11615.696
1993	12632.988
1994	12437.302
1995	12786.513
1996	12675.422
1997	12545.189
1998	12122.799
1999	12170.821
2000	12145.021
2001	12113.623
2002	12162.878
2003	12137.373
2004	12112.898
2005	11985.751
2006	11963.509
2007	11914.704
2008	11785.266
2009	11234.545
2010	11018.205
2011	11089.205
2012	11005.572
2013	11057.237
2014	10781.992
2015	10727.857
2016	10701.692
2017	10688.661
2018	10844.479
2019	11038.447
2020	11225.177
2021	11386.269
2022	11539.595