56% (1961)

65% (1982)

45% (1968)

56% (1965)

62% (1959)

53% (1971)

53% (1964)

60% (1960)

54% (1965)

0% (1966)

56% (1967)

44% (1970)

44% (1979)

53% (1969)

47% (1974)

40% (1977)

50% (1969)

73% (1968)

62% (1968)

47% (1960)