39% (1985)

47% (1974)

37% (1990)

48% (1986)

37% (1979)

40% (1988)

42% (1986)

54% (1982)

39% (1973)

46% (1978)

57% (1976)

43% (1983)

41% (1972)

48% (1988)

0% (1975)

50% (1991)

50% (1970)

38% (1972)

51% (1981)

54% (1970)