78% (1964)

71% (2007)

70% (2009)

65% (1956)

63% (2010)

40% (1968)

67% (1997)

66% (1989)

80% (1994)

45% (2009)

62% (2004)

70% (1986)

72% (1992)

0% (1956)

60% (1961)

68% (1954)

0% (1990)

0% (1988)

0% (1967)

55% (1987)