61% (1994)

76% (1997)

77% (1996)

75% (1999)

71% (1990)

74% (2002)

66% (1992)

62% (2002)

40% (2001)

60% (1997)

60% (1996)

40% (1996)

66% (1993)

65% (1998)

61% (2000)

70% (1998)

54% (1995)

64% (2002)

59% (1998)

63% (1991)