31% (2001)

58% (2009)

26% (2001)

59% (1999)

59% (2010)

67% (2006)

53% (2009)

60% (1997)

40% (2005)

48% (2007)

40% (2000)

58% (2008)

52% (2008)

61% (2000)

56% (2006)

62% (1986)

50% (2001)

66% (2007)

52% (2007)

67% (2006)