54% (1983)

78% (1983)

58% (1983)

60% (1981)

48% (1981)

53% (1984)

56% (1977)

58% (1988)

58% (1987)

50% (1977)

57% (1981)

70% (1994)

50% (1975)

50% (1988)

69% (1977)

62% (1971)

57% (1982)

35% (1987)

60% (1987)

57% (1979)