Year	US Dollars adjusted for inflation)
1991	710.072
1992	731.277
1993	732.701
1994	778.462
1995	802.403
1996	820.277
1997	850.314
1998	873.178
1999	918.697
2000	956.986
2001	931.039
2002	965.644
2003	1027.867
2004	1121.655
2005	1217.428
2006	1292.032
2007	1362.066
2008	1394.508
2009	1346.604
2010	1384.84
2011	1451.815
2012	1526.151
2013	1609.499
2014	1689.042
2015	1776.561
2016	1866.083
2017	1965.383
2018	2067.231
2019	2178.61
2020	2298.907
2021	2431.169
2022	2572.44