Year	US Dollars adjusted for inflation)
1991	33208.965
1992	30688.729
1993	31122.246
1994	30705.617
1995	29555.941
1996	29091.336
1997	30266.469
1998	30487.354
1999	29891.672
2000	30730.062
2001	29924.477
2002	30107.752
2003	30802.596
2004	30353.068
2005	31176.051
2006	32718.688
2007	32740.133
2008	33011.082
2009	32323.99
2010	32703.398
2011	32982.625
2012	33633.184
2013	33135.055
2014	34346.68
2015	33983.855
2016	33410.41
2017	34467.242
2018	34916.613
2019	35445.418
2020	36066.082
2021	36773.395
2022	37547.5