Year	US Dollars adjusted for inflation)
1989	9.3
1990	9.7
1991	8.55
1992	6.27
1993	5.97
1994	6.85
1995	7.6
1996	8.05
1997	8.35
1998	8.73
1999	9.23
2000	10.09
2001	10.72
2002	11.28
2003	11.77
2004	13.01
2005	14.04
2006	15.07