Year	US Dollars adjusted for inflation)
1991	1091.394
1992	1062.508
1993	1040.478
1994	1023.326
1995	1027.838
1996	1046.794
1997	1056.191
1998	1068.106
1999	1091.92
2000	1116.501
2001	1153.241
2002	1183.446
2003	1233.362
2004	1296.026
2005	1364.761
2006	1389.936
2007	1453.094
2008	1477.223
2009	1490.666
2010	1543.263
2011	1621.777
2012	1644.177
2013	1703.187
2014	1751.644
2015	1814.67
2016	1879.41
2017	1943.804
2018	2014.264
2019	2091.048
2020	2168.438
2021	2239.139
2022	2309.886