60% (1972)

59% (1979)

56% (1972)

55% (1984)

37% (1984)

60% (1969)

51% (1968)

60% (1981)

54% (1979)

64% (1981)

53% (1980)

50% (1971)

72% (1982)

56% (1985)

54% (1982)

65% (1986)

55% (1964)

73% (1964)

0% (1969)

59% (1984)