82% (1995)

61% (2008)

56% (2007)

61% (2002)

53% (2004)

60% (1999)

66% (1997)

70% (1993)

66% (1997)

65% (1994)

52% (2006)

66% (2011)

68% (1999)

67% (1999)

68% (2000)

79% (1991)

51% (1993)

73% (2009)

55% (2002)

73% (1992)