60% (2004)

57% (2008)

69% (2012)

62% (1997)

69% (1998)

67% (2009)

61% (2002)

56% (1986)

66% (1999)

40% (1987)

62% (2002)

64% (2010)

56% (1986)

65% (2008)

54% (1998)

56% (1997)

58% (2003)

58% (2000)

64% (2000)

70% (2000)