73% (1990)

72% (1970)

57% (1971)

62% (1964)

43% (1978)

50% (1992)

61% (1972)

61% (1959)

57% (1968)

61% (1958)

59% (1965)

41% (1964)

70% (1970)

58% (1968)

63% (1959)

55% (1962)

59% (1963)

64% (1966)

65% (1968)

46% (1971)