67% (1999)

67% (2009)

64% (2008)

64% (2010)

58% (1995)

62% (2002)

57% (2000)

65% (2000)

57% (1997)

64% (1999)

55% (1989)

58% (2008)

58% (2012)

59% (2000)

55% (1986)

69% (2012)

60% (1989)

60% (2004)

58% (2003)

69% (1998)