52% (1991)

68% (1992)

44% (1992)

58% (1994)

44% (1994)

33% (1994)

44% (2001)

45% (1998)

55% (1995)

32% (1988)

44% (1989)

44% (1997)

57% (1993)

43% (1996)

54% (1993)

50% (1993)

70% (1997)

30% (1997)

67% (1996)

31% (1989)