Year	US Dollars adjusted for inflation)
1991	6186.319
1992	6267.494
1993	6413.653
1994	6369.752
1995	6676.939
1996	6711.696
1997	6920.076
1998	7063.836
1999	7044.565
2000	7326.051
2001	7471.814
2002	7573.189
2003	7592.251
2004	7539.628
2005	7666.171
2006	7865.313
2007	7894.282
2008	8185.271
2009	8377.681
2010	8816.963
2011	8867.396
2012	8943.155
2013	8977.555
2014	9194.383
2015	9557.453
2016	9768.345
2017	9923.342
2018	10168.359
2019	10430.346
2020	10724.016
2021	11038.363
2022	11365.15