75% (2001)

61% (1998)

75% (1999)

62% (2009)

71% (2006)

68% (2010)

69% (2004)

69% (2006)

73% (1987)

65% (1994)

67% (1996)

74% (2002)

63% (2000)

64% (1996)

63% (1987)

60% (2003)

69% (1998)

75% (1994)

62% (2003)

65% (1991)