75% (2008)

62% (1995)

69% (1989)

68% (1990)

68% (1993)

72% (1999)

72% (1982)

59% (2001)

66% (1998)

74% (1995)

60% (1986)

69% (2003)

66% (1981)

72% (1985)

68% (2007)

64% (2005)

55% (1999)

71% (1993)

57% (1988)

64% (1991)