70% (2007)

70% (2009)

61% (2010)

60% (1961)

78% (1964)

61% (2004)

67% (1997)

70% (1986)

68% (1971)

53% (1983)

65% (1985)

0% (1985)

65% (1956)

71% (1986)

64% (2003)

64% (1982)

46% (2009)

0% (1966)

70% (1989)

75% (1992)