Year	US Dollars adjusted for inflation)
1991	1214.395
1992	1137.774
1993	941.356
1994	1056.569
1995	1108.247
1996	1165.963
1997	1289.027
1998	1213.772
1999	1200.573
2000	1150.202
2001	1097.416
2002	1055.71
2003	1076.971
2004	1068.133
2005	1049.621
2006	1062.496
2007	1063.141
2008	1064.093
2009	1078.952
2010	1100.007
2011	1132.732
2012	1154.586
2013	1167.152
2014	1201.8
2015	1231.732
2016	1257.832
2017	1294.703
2018	1337.743
2019	1381.81
2020	1426.83
2021	1471.517
2022	1517.772