67% (2001)

70% (2003)

71% (1999)

52% (1990)

62% (1986)

66% (1998)

54% (1987)

64% (2005)

74% (1991)

44% (1998)

60% (2000)

77% (1998)

71% (1999)

44% (1988)

60% (1988)

60% (1986)

0% (1988)

58% (1997)

59% (1989)

47% (1992)