55% (2007)

61% (2003)

68% (2005)

69% (2006)

64% (2011)

69% (2006)

55% (1992)

68% (2012)

63% (2001)

68% (2009)

68% (2010)

69% (2007)

80% (1991)

73% (1986)

10% (1999)

67% (1996)

0% (1988)

0% (1987)