63% (1951)

61% (1993)

70% (1970)

57% (2000)

67% (1971)

64% (2008)

61% (1964)

62% (1997)

62% (1992)

43% (1997)

51% (1979)

69% (1949)

71% (1953)

52% (2003)

50% (1996)

65% (1995)

63% (2007)

70% (1938)

61% (1974)

67% (1963)