57% (1988)

77% (1994)

76% (1997)

58% (1996)

68% (1993)

40% (1985)

65% (1989)

40% (1976)

47% (1992)

0% (1977)

0% (1990)

0% (1988)

52% (1989)

0% (1994)

0% (1972)

0% (1983)

0% (1989)

60% (1993)

0% (1985)

0% (1992)