Year	US Dollars adjusted for inflation)
1991	13376.799
1992	13579.563
1993	13667.764
1994	14327.804
1995	14862.613
1996	15331.046
1997	16031.932
1998	15628.246
1999	16374.004
2000	16014.28
2001	16000.126
2002	16936.598
2003	17712.885
2004	17243.48
2005	17097.754
2006	17231.449
2007	18179.896
2008	18821.086
2009	16852.9
2010	19131.867
2011	18471.756
2012	17841.316
2013	18638.393
2014	18882.316
2015	18059.297
2016	18194.229
2017	18222.85
2018	18661.768
2019	19192.094
2020	19711.836
2021	20236.242
2022	20775.393