67% (1982)

51% (1981)

54% (1976)

65% (1976)

61% (1979)

54% (1979)

67% (1975)

70% (1976)

62% (1976)

68% (1974)

60% (1978)

45% (1981)

64% (1977)

61% (1982)

54% (1978)

45% (1974)

52% (1983)

64% (1977)

0% (1978)

57% (1979)