67% (2009)

65% (1999)

59% (1994)

65% (1990)

65% (2008)

72% (2001)

46% (2005)

68% (1984)

71% (1989)

70% (2006)

69% (1990)

74% (2002)

49% (2000)

55% (1999)

61% (1995)

64% (2009)

57% (2009)

59% (2001)

62% (2002)

71% (1966)