76% (1997)

77% (1996)

75% (1999)

70% (1990)

66% (1992)

62% (2002)

60% (1997)

80% (1991)

63% (1991)

70% (1998)

40% (2001)

74% (2002)

60% (1996)

55% (1992)

59% (1993)

60% (1994)

58% (1997)

59% (2002)

61% (1989)

61% (1996)