1980	360.86
1981	587.73
1982	603.95
1983	700.14
1984	548.08
1985	336.37
1986	413.05
1987	287.70
1988	388.40
1989	740.65
1990	545.45
1991	818.71
1992	487.56
1993	623.08
1994	575.87
1995	932.54
1996	376.12
1997	640.03
1998	716.67
1999	976.86