60% (1999)

51% (1997)

48% (1996)

70% (1996)

65% (2001)

15% (1994)

28% (2001)

44% (2003)

60% (1995)

75% (1991)

69% (1999)

50% (1998)

65% (1990)

54% (1993)

54% (2000)

79% (1995)

70% (1994)

25% (1999)

60% (2000)

50% (2001)