72% (1987)

59% (1987)

55% (1975)

48% (1976)

62% (1969)

60% (1980)

58% (1978)

44% (1965)

43% (1977)

50% (1982)

48% (1970)

58% (1978)

43% (1984)

42% (1972)

70% (1980)

30% (1982)

46% (1977)

58% (1982)

55% (1968)

58% (1979)