63% (1981)

70% (1979)

58% (1982)

74% (1978)

78% (1980)

65% (1979)

70% (1980)

70% (1984)

63% (1981)

80% (1978)

63% (1984)

70% (1980)

0% (1981)

70% (1984)

50% (1980)

64% (1981)

20% (1978)

85% (1980)

0% (1979)

63% (1981)