Year	US Dollars adjusted for inflation)
1991	5193.756
1992	5454.339
1993	5831.587
1994	6203.029
1995	6560.52
1996	6763.327
1997	6428.568
1998	6032.835
1999	6243.241
2000	6346.868
2001	6448.331
2002	6704.681
2003	7082.44
2004	7417.072
2005	7613.526
2006	7945.658
2007	8245.686
2008	8303.168
2009	8218.483
2010	8732.875
2011	8644.089
2012	9252.719
2013	9629.023
2014	9742.229
2015	10184.169
2016	10493.761
2017	10922.228
2018	11281.676
2019	11641.746
2020	12017.929
2021	12420.066
2022	12844.351