68% (2001)

70% (1997)

56% (1986)

69% (1990)

65% (2003)

62% (1987)

59% (1996)

62% (2017)

47% (2001)

66% (1998)

61% (2014)

60% (2012)

63% (2013)

63% (2004)

72% (1998)

62% (1992)

60% (2011)

71% (2008)

65% (2011)

65% (2015)