75% (1936)

68% (1930)

68% (1960)

61% (1956)

61% (1959)

62% (2001)

65% (2005)

67% (2005)

57% (2005)

59% (1963)

66% (2005)

72% (1966)

51% (2006)

52% (2000)

63% (2002)

67% (1993)

54% (1982)

59% (1990)

58% (1972)

65% (1988)