76% (2000)

56% (2000)

61% (1999)

58% (1998)

63% (2000)

65% (1999)

69% (2000)

61% (2000)

72% (1999)

63% (1997)

64% (1998)

59% (1998)

58% (1997)

61% (1999)

60% (1998)

65% (1997)

40% (1996)

56% (2000)

61% (2000)

57% (1997)