63% (1968)

74% (1981)

70% (1980)

67% (1970)

70% (1967)

63% (1982)

73% (1971)

62% (1981)

63% (1965)

65% (1964)

70% (1965)

53% (1967)

54% (1982)

52% (1980)

61% (1976)

67% (1964)

65% (1971)

57% (1969)

70% (1967)

60% (1966)