60% (1964)

61% (1978)

60% (1968)

48% (1981)

55% (1962)

68% (1970)

46% (1989)

58% (1981)

58% (1968)

50% (1976)

70% (1982)

58% (1986)

71% (1980)

62% (1965)

65% (1986)

60% (1994)

79% (2000)

49% (1989)

53% (1977)

25% (1991)