67% (1974)

50% (1981)

58% (1983)

60% (1979)

60% (1977)

70% (1980)

48% (1985)

70% (1979)

63% (1981)

63% (1986)

10% (1988)

60% (1974)

67% (1988)

77% (1987)

50% (1974)

77% (1982)

64% (1980)

0% (1970)

0% (1985)

67% (1977)