75% (2008)

68% (1993)

62% (1995)

73% (1982)

68% (2007)

69% (2003)

74% (1995)

68% (1990)

69% (1989)

72% (1999)

64% (2005)

66% (1998)

60% (1986)

72% (1985)

71% (1993)

63% (2011)

59% (2001)

66% (1981)

55% (1999)

64% (2001)