Year	US Dollars adjusted for inflation)
1991	6999.576
1992	6914.169
1993	7041.918
1994	7136.403
1995	7324.646
1996	7600.484
1997	7469.347
1998	7255.538
1999	7264.161
2000	6755.772
2001	6510.07
2002	6445.372
2003	6348.652
2004	6401.472
2005	6252.822
2006	6418.312
2007	6570.535
2008	6817.221
2009	6443.12
2010	7280.97
2011	7421.794
2012	6824.316
2013	7751.687
2014	8205.237
2015	8240.421
2016	8390.492
2017	8533.644
2018	8658.395
2019	8845.783
2020	9018.507
2021	9197.2
2022	9377.516