76% (2011)

74% (2011)

70% (2008)

75% (2008)

75% (2010)

0% (1990)

60% (1997)

47% (1979)

80% (1973)

77% (2009)

81% (2006)

75% (1988)

50% (1996)

75% (2008)

20% (1987)

78% (2010)

81% (2007)

73% (1995)

56% (2014)

69% (2015)