56% (1971)

80% (1965)

54% (1983)

56% (1989)

59% (1964)

61% (1971)

56% (1971)

61% (1972)

55% (1968)

44% (1975)

42% (1992)

62% (1980)

60% (1982)

35% (1984)

27% (1986)

61% (1972)

43% (1979)

45% (1975)

30% (1973)

50% (1970)