75% (2008)

68% (1993)

75% (1995)

70% (2003)

72% (1999)

69% (1989)

73% (1982)

63% (1995)

69% (1990)

64% (2005)

66% (1998)

68% (2007)

71% (1993)

65% (1999)

61% (1986)

72% (1985)

56% (1999)

65% (2001)

67% (1981)

64% (1991)