70% (1951)

59% (2005)

62% (1983)

59% (1959)

61% (1996)

70% (1957)

60% (2002)

56% (1991)

78% (2003)

62% (2003)

69% (1981)

75% (1980)

58% (2003)

58% (2010)

53% (2000)

67% (1977)

60% (1990)

62% (1932)

53% (1981)

53% (1994)