57% (1971)

60% (1985)

66% (1939)

61% (1960)

64% (1935)

64% (1961)

58% (1968)

62% (1957)

55% (2007)

54% (1987)

56% (1989)

66% (1996)

64% (1944)

38% (1985)

60% (1930)

71% (2005)

64% (2001)

47% (1993)

66% (1940)

57% (1966)