50% (1971)

94% (2008)

30% (1969)

0% (1987)

60% (1985)

87% (2003)

86% (1977)

80% (1998)

90% (1997)

60% (1979)

50% (1952)

71% (1972)

58% (1977)

70% (1985)

70% (2010)

69% (1976)

50% (2003)

78% (1981)

74% (1978)

51% (2002)