68% (2001)

63% (2006)

49% (2000)

60% (1997)

64% (1999)

52% (2003)

50% (2000)

60% (1982)

62% (1996)

63% (1988)

77% (1987)

60% (1993)

39% (1987)

69% (1984)

65% (1997)

60% (1985)