69% (1979)

71% (1971)

62% (1968)

63% (1968)

70% (1966)

52% (1970)

58% (1989)

62% (1969)

54% (1964)

51% (1969)

50% (1982)

62% (1963)

30% (1960)

66% (1966)

61% (1982)

70% (1966)

68% (1967)

52% (1958)

50% (1964)

52% (1968)