Year	US Dollars adjusted for inflation)
1991	2753.732
1992	2711.707
1993	2670.534
1994	2656.622
1995	2699.867
1996	2759.312
1997	2811.41
1998	2846.616
1999	2857.719
2000	2904.388
2001	2949.48
2002	2974.225
2003	3060.835
2004	3185.639
2005	3311.303
2006	3466.094
2007	3650.186
2008	3787.095
2009	3802.818
2010	3931.525
2011	4062.677
2012	4181.423
2013	4289.934
2014	4406.927
2015	4471.514
2016	4547.283
2017	4645.318
2018	4766.169
2019	4892.473
2020	5039.494
2021	5190.942
2022	5346.656