Year	US Dollars adjusted for inflation)
1991	17.95
1992	17.67
1993	17.3
1994	17.31
1995	17.22
1996	17.72
1997	18.34
1998	18.98
1999	20.01
2000	20.47
2001	20.81
2002	22.21
2003	24.6
2004	24.85
2005	26.52