56% (1964)

35% (1983)

53% (1984)

27% (1986)

35% (1971)

31% (1981)

32% (1980)

42% (1981)

52% (1964)

53% (1965)

10% (1975)

43% (1982)

60% (1964)

43% (1970)

39% (1964)

50% (1981)

43% (1971)

10% (1984)