48% (1985)

45% (1961)

46% (1989)

42% (1974)

42% (1982)

65% (1980)

43% (1962)

57% (1961)

50% (1976)

39% (1978)

47% (1960)

59% (1986)

55% (1973)

45% (1977)

36% (1981)

48% (1982)

39% (1975)

46% (1967)

43% (1986)

45% (1971)