46% (1977)

48% (1962)

59% (1987)

44% (1975)

44% (1961)

55% (1984)

53% (1979)

54% (1978)

55% (1981)

24% (1963)

36% (1981)

52% (1982)

22% (1968)

50% (1976)

43% (1982)

60% (1964)

41% (1976)

30% (1963)

46% (1988)

32% (1984)