60% (2009)

52% (2004)

54% (1996)

40% (1991)

62% (1997)

63% (2005)

57% (2005)

65% (1997)

54% (2008)

52% (2003)

54% (2010)

55% (1996)

64% (2001)

58% (1998)

57% (2008)

48% (1995)

51% (1993)

43% (2011)

50% (1997)

60% (1998)