71% (2005)

66% (2010)

60% (2010)

67% (2008)

78% (2003)

58% (2001)

61% (2012)

72% (2007)

74% (2002)

62% (2002)

58% (1996)

73% (1989)

65% (1999)

60% (1996)

67% (1991)

58% (1995)

65% (2015)

59% (1994)

69% (1992)

59% (2024)