81% (1994)

74% (1998)

60% (1994)

59% (1999)

79% (1987)

72% (2006)

77% (1983)

52% (1980)

66% (2000)

68% (1981)

70% (1980)

73% (1982)

85% (1984)

67% (2003)

65% (1984)

63% (1980)

60% (1987)

46% (2000)

62% (1995)

40% (2005)