68% (1993)

75% (2008)

70% (2003)

75% (1995)

72% (1999)

68% (2007)

63% (1995)

72% (1982)

71% (1993)

69% (1989)

64% (2005)

72% (1985)

68% (1990)

66% (1998)

65% (2001)

56% (1999)

65% (1999)

67% (1981)

63% (2011)

64% (1991)