70% (2000)

72% (1994)

68% (1998)

78% (1994)

70% (1999)

70% (1995)

62% (1995)

66% (1998)

53% (1998)

77% (1997)

72% (1998)

70% (1999)

64% (1998)

64% (1994)

50% (1989)

65% (1995)

63% (1997)

67% (1994)

70% (1999)

53% (1997)