67% (2000)

60% (1997)

67% (2007)

66% (2003)

68% (2004)

57% (2004)

54% (2012)

46% (2004)

59% (2006)

59% (2001)

61% (2009)

51% (2003)

56% (1999)

51% (2004)

70% (1991)

58% (1993)

38% (2011)

30% (2000)

52% (2001)

70% (2002)