75% (1970)

56% (1984)

59% (1963)

70% (1960)

70% (1961)

72% (1962)

67% (1959)

61% (1968)

59% (1965)

66% (1964)

62% (1960)

72% (1966)

57% (1969)

48% (1970)

47% (1977)

57% (1967)

50% (1979)

55% (1965)

40% (1969)