40% (1988)

44% (1992)

51% (1991)

68% (1992)

58% (1994)

44% (2001)

54% (1995)

45% (1998)

44% (1989)

55% (1993)

44% (1994)

56% (1993)

43% (1996)

34% (1994)

44% (1997)

62% (1996)

31% (1989)

43% (1997)

70% (1997)

50% (1993)