48% (1977)

40% (2006)

91% (2008)

70% (2000)

70% (1998)

65% (1975)

62% (1981)

30% (2012)

50% (1967)

87% (2003)

50% (1960)

50% (1956)

64% (1989)

50% (1977)

55% (1979)

63% (1996)

82% (1979)

62% (1977)

50% (1982)

72% (1988)