67% (1982)

60% (1978)

65% (1976)

64% (1977)

51% (1981)

62% (1976)

54% (1979)

56% (1976)

61% (1982)

45% (1974)

61% (1979)

52% (1983)

68% (1976)

62% (1977)

68% (1974)

68% (1975)

57% (1979)

54% (1978)

0% (1978)

45% (1981)