44% (1974)

46% (1975)

60% (1980)

50% (1983)

53% (1973)

46% (1980)

48% (1976)

34% (1969)

36% (1973)

53% (1980)

46% (1977)

41% (1976)

46% (1986)

55% (1984)

53% (1976)

37% (1985)

53% (1985)

42% (1982)

53% (1982)

45% (1961)