Year	US Dollars adjusted for inflation)
1991	6706.508
1992	6058.479
1993	5603.94
1994	4945.954
1995	4423.356
1996	4547.078
1997	5062.095
1998	5475.914
1999	5643.939
2000	5918.172
2001	6156.647
2002	6425.367
2003	6832.746
2004	7566.572
2005	8221.508
2006	9001.24
2007	9717.837
2008	10641.108
2009	10596.226
2010	11391.384
2011	11928.889
2012	12097.662
2013	12190.329
2014	12397.229
2015	11937.808
2016	11675.192
2017	12016.644
2018	12476.137
2019	12860.893
2020	13211.129
2021	13606.493
2022	14044.791