Year	US Dollars adjusted for inflation)
1991	913.304
1992	837.48
1993	919.396
1994	819.347
1995	950.567
1996	1003.067
1997	1016.309
1998	1025.953
1999	1027.323
2000	1013.021
2001	938.488
2002	931.044
2003	959.068
2004	983.069
2005	985.448
2006	997.615
2007	1057.604
2008	1098.787
2009	1148.501
2010	1182.53
2011	1194.767
2012	1170.542
2013	1184.538
2014	1211.597
2015	1204.916
2016	1194.647
2017	1203.555
2018	1219.65
2019	1242.557
2020	1272.166
2021	1300.349
2022	1330.306