Year	US Dollars adjusted for inflation)
1991	7934.771
1992	7792.953
1993	7948.674
1994	8230.499
1995	8576.195
1996	8596.665
1997	8567.559
1998	8784.029
1999	9115.733
2000	9431.551
2001	9654.703
2002	9902.808
2003	10053.104
2004	9816.093
2005	9788.315
2006	9417.544
2007	8922.677
2008	9133.122
2009	9279.624
2010	9559.099
2011	9791.218
2012	9834.664
2013	9462.696
2014	9611.873
2015	9915.124
2016	10130.897
2017	10385.96
2018	10648.977
2019	10850.374
2020	11004.882
2021	11107.208
2022	11225.477