44% (2000)

72% (2003)

60% (2004)

68% (2003)

61% (1998)

61% (2000)

61% (1996)

68% (1996)

53% (2001)

54% (1998)

37% (2002)

65% (2003)

51% (1994)

30% (1997)

36% (1995)

60% (1997)

56% (1997)

48% (2002)

58% (1997)

46% (1994)