49% (1982)

46% (1977)

49% (1976)

59% (1986)

42% (1972)

57% (1973)

15% (1969)

52% (1982)

43% (1982)

54% (1978)

44% (1961)

46% (1980)

36% (1978)

53% (1986)

38% (1977)

42% (1962)

39% (1972)

36% (1981)

37% (1972)

53% (1973)