50% (1960)

72% (2009)

0% (1965)

75% (2000)

70% (1988)

50% (1989)

0% (1983)

0% (1950)

50% (1977)

0% (1993)

40% (1959)

50% (2001)

0% (2007)

50% (1979)

100% (1975)

0% (1967)

0% (2005)

0% (1978)

66% (1973)

50% (1978)