68% (1974)

61% (1987)

68% (1977)

58% (1979)

62% (1978)

45% (1994)

72% (1979)

57% (1977)

69% (1977)

63% (1980)

40% (1996)

60% (1978)

53% (1976)

62% (1974)

43% (1978)

66% (1979)

25% (1980)

40% (1976)

67% (1982)

57% (1972)