Year	%
1969	2
1970	2
1971	2
1972	2
1973	2.458333333
1974	2.5
1975	4
1976	4
1977	4
1978	4
1979	4.041666666
1980	4.5
1981	5.5
1982	7.5
1983	8.5
1984	8.5
1985	14
1986	15.3125
1987	16.25
1988	20.625
1989	25