72% (1987)

59% (1987)

55% (1975)

62% (1969)

30% (1982)

60% (1980)

58% (1979)

60% (1991)

25% (1990)

48% (1970)

44% (1965)

43% (1977)

58% (1978)

70% (1980)

50% (1979)

46% (1977)

55% (1968)

48% (1976)

58% (1982)

50% (1982)