59% (1964)

56% (1971)

56% (1989)

42% (1992)

27% (1986)

80% (1965)

61% (1972)

35% (1984)

63% (1972)

44% (1975)

61% (1971)

0% (1986)

44% (1975)

35% (1974)

54% (1983)

50% (1970)

60% (1982)

62% (1980)

56% (1971)

55% (1968)