67% (1982)

70% (1976)

51% (1981)

65% (1977)

65% (1976)

61% (1978)

62% (1979)

67% (1975)

64% (1977)

55% (1976)

62% (1976)

68% (1974)

54% (1979)

45% (1974)

54% (1978)

61% (1982)

45% (1981)

52% (1983)

0% (1978)

60% (1974)