66% (2009)

72% (1975)

63% (2006)

59% (2008)

71% (1981)

53% (1992)

68% (1977)

66% (1992)

67% (2008)

61% (2003)

64% (1997)

62% (2000)

57% (2005)

54% (1985)

58% (2008)

38% (1987)

53% (1989)

60% (1982)

66% (2009)

58% (2007)