70% (2005)

67% (2010)

67% (2008)

60% (2010)

58% (2001)

74% (2002)

61% (2012)

78% (2003)

62% (1998)

72% (2007)

57% (1996)

66% (1999)

62% (2002)

60% (1996)

72% (1989)

67% (1991)

58% (1994)

57% (1995)

64% (2015)

69% (1992)