55% (1999)

62% (2001)

48% (2004)

69% (1996)

71% (1994)

71% (1992)

63% (1992)

59% (2002)

70% (2007)

63% (1985)

58% (2007)

74% (1987)

61% (1987)

48% (2001)

64% (1995)

64% (1987)

61% (1996)

55% (2010)

65% (2008)

62% (2007)