68% (1974)

58% (1979)

63% (1980)

69% (1977)

60% (1987)

72% (1979)

62% (1978)

69% (1977)

60% (1978)

53% (1976)

40% (1996)

45% (1994)

57% (1977)

43% (1978)

67% (1982)

40% (1976)

57% (1972)

62% (1974)

66% (1979)

25% (1980)