52% (2008)

57% (2006)

31% (2001)

48% (2008)

52% (2007)

56% (2006)

53% (2009)

66% (2001)

48% (2007)

67% (2006)

59% (1999)

58% (2008)

61% (2000)

35% (2010)

60% (1997)

40% (2000)

62% (2007)

59% (2010)

62% (1986)

50% (2001)