67% (1974)

71% (1979)

63% (1980)

61% (1987)

68% (1977)

62% (1978)

58% (1979)

68% (1977)

43% (1996)

60% (1978)

51% (1976)

43% (1978)

45% (1994)

57% (1977)

40% (1976)

61% (1974)

66% (1979)

67% (1982)

57% (1972)

25% (1980)