77% (1997)

0% (2000)

50% (2005)

64% (1970)

60% (2008)

28% (2009)

76% (1999)

51% (1999)

60% (2007)

71% (2000)

30% (1970)

55% (2008)

75% (1999)

50% (2000)

72% (2003)

35% (1997)

74% (2003)

30% (2005)

80% (2003)

20% (1998)