63% (1981)

74% (1978)

80% (1978)

65% (1979)

70% (1984)

85% (1980)

61% (1980)

20% (1978)

66% (1982)

60% (1981)

70% (1981)

70% (1979)

70% (1984)

64% (1981)

67% (1980)

64% (1983)

70% (1980)

70% (1980)

67% (1983)

78% (1980)