57% (1984)

75% (1970)

60% (1963)

69% (1961)

72% (1962)

66% (1959)

70% (1960)

60% (1965)

60% (1968)

72% (1966)

61% (1960)

48% (1970)

66% (1964)

47% (1977)

40% (1969)

56% (1969)

55% (1965)

58% (1967)

50% (1979)