54% (2004)

63% (2009)

64% (2006)

60% (2011)

56% (2005)

62% (2004)

62% (2009)

53% (2003)

60% (2006)

45% (2001)

72% (1995)

64% (2001)

60% (2008)

57% (2007)

48% (2007)

30% (2010)

39% (2004)

55% (1997)

58% (1996)

40% (2007)