67% (1974)

71% (1979)

61% (1987)

62% (1978)

63% (1980)

57% (1979)

68% (1977)

68% (1977)

61% (1974)

60% (1978)

67% (1982)

66% (1979)

51% (1976)

25% (1980)

45% (1994)

43% (1978)

43% (1996)

57% (1977)

40% (1976)

57% (1972)