70% (2007)

70% (2009)

67% (1997)

70% (1989)

68% (1971)

40% (1968)

0% (1990)

0% (1988)

78% (1964)

61% (2004)

0% (1979)

60% (1987)

70% (1986)

66% (1989)

80% (1958)

0% (1966)

70% (1987)

62% (1984)

60% (1988)

46% (2009)