75% (2008)

68% (1993)

72% (1999)

75% (1995)

63% (1995)

69% (2003)

64% (2005)

72% (1982)

68% (1990)

66% (1998)

69% (1989)

68% (2007)

72% (1985)

71% (1993)

56% (1999)

66% (2002)

65% (1999)

64% (2001)

64% (1991)

61% (1986)