60% (1960)

67% (1986)

70% (1975)

65% (2004)

50% (1963)

66% (2004)

65% (1979)

58% (1955)

73% (1983)

48% (1996)

64% (2008)

50% (1959)

50% (1962)

61% (2006)

60% (1957)

75% (1964)

60% (1951)

63% (1971)

58% (1996)

54% (1969)