67% (1978)

40% (1995)

47% (1987)

60% (1998)

58% (1979)

55% (1999)

52% (1996)

50% (1999)

58% (1984)

55% (1993)

40% (1987)

20% (1997)

70% (1983)

0% (1983)

70% (1983)

0% (1989)

0% (1980)

60% (1996)

52% (1992)

0% (1999)