70% (1979)

45% (1990)

70% (1962)

69% (1963)

69% (1965)

66% (1964)

61% (1971)

64% (1968)

61% (1966)

50% (1988)

66% (1972)

58% (1983)

53% (1985)

49% (1987)

68% (1971)

69% (2006)

63% (1964)

67% (1969)

61% (1965)

56% (1966)