55% (2007)

68% (2005)

61% (2003)

69% (2006)

63% (2001)

55% (1992)

64% (2011)

70% (2006)

69% (2010)

70% (2007)

72% (1986)

68% (2009)

10% (1999)

68% (2012)

81% (1991)

67% (1996)

0% (1987)

0% (1988)