75% (2005)

59% (2004)

50% (2006)

51% (2007)

51% (2008)

64% (1999)

56% (2007)

69% (1988)

51% (2004)

60% (2001)

70% (1999)

70% (2004)

60% (2005)

40% (2002)

0% (1997)