68% (1969)

63% (1966)

56% (1971)

57% (1971)

59% (1974)

70% (1969)

70% (1972)

68% (1968)

62% (1962)

50% (1961)

56% (1969)

50% (1959)

63% (1967)

60% (1989)

58% (1964)

60% (1958)

57% (1966)

50% (1968)

63% (1973)

50% (1958)