68% (1993)

75% (2008)

70% (2003)

75% (1995)

72% (1999)

63% (1995)

69% (1989)

72% (1982)

68% (2007)

71% (1993)

66% (1998)

64% (2005)

68% (1990)

65% (1999)

65% (2001)

56% (1999)

72% (1985)

59% (2014)

64% (1991)

67% (1981)