72% (1987)

59% (1987)

62% (1969)

43% (1977)

25% (1990)

58% (1979)

48% (1976)

55% (1968)

55% (1975)

42% (1970)

30% (1984)

44% (1965)

42% (1976)

50% (1982)

58% (1978)

50% (1979)

30% (1982)

60% (1991)

46% (1977)

58% (1982)