73% (1991)

70% (2012)

62% (1998)

69% (1994)

53% (2007)

64% (2003)

51% (1999)

59% (2003)

71% (1995)

68% (1989)

40% (2001)

55% (1994)

57% (2006)

58% (2009)

47% (2014)

73% (2009)

44% (1992)

59% (1992)

65% (1992)

40% (2011)