Year	Percent
1980-01-01	7.50000
1981-01-01	7.50000
1982-01-01	7.50000
1983-01-01	7.50000
1984-01-01	3.50000
1985-01-01	2.75000
1986-01-01	6.00000
1987-01-01	8.41667
1988-01-01	9.50000