72% (1987)

59% (1987)

55% (1975)

60% (1980)

43% (1977)

62% (1969)

58% (1978)

60% (1991)

48% (1976)

50% (1979)

58% (1982)

46% (1977)

0% (1973)

50% (1982)

39% (1976)

43% (1984)

55% (1980)

58% (1979)

48% (1970)

30% (1982)