69% (1996)

51% (1987)

70% (2000)

72% (1959)

55% (1985)

71% (1947)

66% (1953)

64% (1950)

50% (2009)

66% (1986)

57% (2007)

68% (1971)

62% (1981)

75% (1964)

53% (1996)

57% (1991)

57% (1997)

48% (2006)

65% (1978)

67% (1954)