75% (2008)

74% (1995)

72% (1999)

69% (2003)

67% (1993)

68% (2007)

63% (1995)

72% (1982)

68% (1990)

69% (1989)

72% (1985)

64% (2005)

66% (1998)

71% (1993)

55% (1999)

64% (1991)

68% (2008)

61% (1986)

58% (2014)

65% (2001)