82% (1985)

73% (1974)

67% (1975)

41% (1976)

66% (1984)

63% (1977)

48% (1983)

85% (1974)

55% (1979)

85% (1986)

55% (1988)

50% (1982)

60% (1991)

58% (1965)

50% (1979)

56% (1987)

40% (1990)

48% (1987)

60% (1981)

50% (1956)