73% (2000)

54% (2010)

50% (2003)

64% (2008)

66% (2008)

48% (2008)

67% (1996)

60% (1991)

57% (2001)

20% (1996)

70% (2007)

75% (2009)

48% (1995)

50% (1997)

50% (1996)

60% (2006)

40% (1995)

70% (2006)

60% (2002)

0% (1995)