68% (1998)

67% (1995)

56% (2011)

52% (2013)

59% (2013)

63% (1988)

60% (1997)

53% (2014)

52% (2002)

62% (2003)

71% (1994)

58% (1988)

51% (2014)

65% (1993)

62% (2010)

47% (2000)

52% (1996)

64% (1994)

73% (2014)

61% (2007)