Year	US Dollars adjusted for inflation)
1991	16802.045
1992	18532.617
1993	19999.324
1994	21090.428
1995	21934.387
1996	22212.74
1997	22846.537
1998	22690.012
1999	21961.359
2000	21675.398
2001	20999.633
2002	19084.369
2003	19297.975
2004	20139.078
2005	21238.645
2006	22191.1
2007	23730.645
2008	24486.307
2009	22793.369
2010	25153.814
2011	25692.799
2012	25191.188
2013	25581.6
2014	24911.92
2015	25172.342
2016	24734.613
2017	25198.785
2018	25614.33
2019	26209.344
2020	27055.086
2021	27811.072
2022	28454.695