65% (2008)

71% (2001)

63% (2001)

69% (2006)

56% (2006)

58% (2004)

60% (1999)

62% (2000)

72% (2005)

55% (2003)

57% (2000)

73% (2000)

67% (1995)

60% (1970)

55% (1999)

75% (1989)

62% (2000)

80% (2009)

57% (2008)

40% (1996)