65% (2008)

59% (1999)

62% (2001)

70% (2006)

54% (2003)

71% (2001)

58% (2004)

62% (2000)

57% (2006)

72% (2005)

56% (2000)

73% (2000)

57% (2008)

67% (1995)

55% (1999)

60% (2007)

0% (1995)

60% (1970)

52% (2008)

40% (1996)