72% (1970)

70% (1974)

85% (1950)

70% (1972)

50% (1978)

0% (1970)

40% (1965)

0% (1969)

64% (1977)

0% (1976)

70% (1973)

50% (1967)

50% (1966)

0% (1964)

0% (1951)

0% (1950)

55% (1975)

0% (1973)

0% (1976)

0% (1973)