56% (1962)

63% (1965)

60% (1987)

50% (1988)

64% (1987)

71% (1972)

55% (1991)

62% (1957)

43% (1987)

61% (1988)

0% (1985)

49% (1991)

65% (1976)

72% (1959)

70% (1981)

64% (1981)

58% (1970)

50% (1990)

54% (1973)

67% (1966)