73% (1991)

70% (2012)

64% (2003)

69% (1994)

62% (1998)

53% (2007)

71% (1995)

59% (2003)

40% (2001)

55% (1994)

68% (1989)

68% (1994)

59% (1992)

51% (1999)

58% (2009)

65% (1992)

40% (2011)

66% (1999)

47% (2014)

44% (1992)