69% (1976)

64% (1985)

53% (1976)

68% (1986)

60% (1996)

58% (1978)

61% (1985)

66% (2002)

62% (1999)

68% (1991)

73% (1971)

60% (1934)

72% (1973)

61% (1997)

64% (1981)

67% (1984)

70% (1955)

72% (1966)

71% (1933)

70% (1951)