Year	US Dollars adjusted for inflation)
1990	15270
1991	13860
1992	13030
1993	13610
1994	14290
1995	14940
1996	15440
1997	16130
1998	16700
1999	17560
2000	18210
2001	18660
2002	19280
2003	19760
2004	20660