52% (1988)

47% (1992)

63% (2001)

58% (1983)

62% (1971)

54% (1952)

47% (1987)

62% (1966)

67% (1950)

60% (1927)

69% (1932)

50% (1941)

61% (1960)

63% (1935)

72% (1945)

54% (1996)

47% (1997)

58% (1960)

61% (1947)

66% (1925)