50% (1974)

55% (1985)

60% (1979)

30% (1980)

76% (1988)

0% (1995)

0% (1992)

0% (1976)

70% (1991)

100% (1994)

100% (1986)

65% (1977)

0% (1997)

80% (1970)

57% (1981)

60% (1985)

0% (1994)

50% (1994)

45% (1980)

60% (1992)