Year	%
1971	75.73831
1972	69.89795
1973	76.28981
1974	85.80794
1975	97.81659
1976	78.90214
1977	86.5834
1979	83.0115
1982	67.12119
1984	83.62666
1985	78.04834
1986	73.07652
1987	70.85989
1988	71.43307
1999	77.2827