76% (2013)

70% (2011)

63% (1971)

75% (1967)

0% (1980)

80% (2007)

60% (2015)

10% (2009)

50% (1988)

0% (1997)

70% (2010)

0% (1977)

80% (1997)

10% (2003)

100% (2001)

60% (1969)

0% (1974)

50% (1999)