50% (1974)

58% (1987)

50% (1978)

60% (1981)

70% (1988)

78% (1983)

64% (1977)

50% (1988)

50% (1990)

50% (1975)

57% (1982)

50% (1986)

63% (1982)

30% (1980)

55% (1979)

0% (1979)

58% (1988)

65% (1984)

58% (1983)

0% (1992)