64% (2008)

56% (2010)

61% (2007)

53% (2005)

59% (2007)

68% (1997)

53% (2006)

0% (1997)

10% (1997)

60% (2006)

42% (1999)

0% (2007)

0% (2006)

55% (1985)

45% (2004)

0% (1981)

65% (2006)

70% (2005)

0% (2008)

50% (1987)