69% (1997)

72% (1992)

72% (1993)

60% (1996)

45% (1995)

48% (1995)

15% (1996)

60% (1992)

100% (1991)

73% (1990)

45% (1995)

65% (1989)

0% (1980)

37% (1993)

100% (1994)

50% (1990)

0% (1994)

53% (1992)

0% (1992)

50% (1994)