65% (2008)

71% (2001)

62% (2000)

70% (2006)

58% (2004)

62% (2001)

59% (1999)

72% (2005)

57% (2006)

57% (2008)

56% (2000)

54% (2003)

40% (1996)

73% (2000)

52% (2008)

69% (1972)

67% (1995)

77% (2008)

80% (2009)

70% (2012)