70% (1972)

68% (1984)

66% (1995)

52% (1993)

71% (1932)

68% (1972)

60% (1968)

65% (1971)

72% (1970)

63% (1964)

63% (1966)

69% (1943)

50% (1971)

54% (2007)

59% (1980)

72% (1978)

59% (1963)

69% (2002)

57% (2002)

55% (1986)