50% (1987)

50% (1989)

83% (1992)

71% (1988)

60% (1990)

0% (1993)

0% (2002)

82% (2002)

60% (1992)

70% (1981)

60% (1978)

57% (1990)

60% (1949)

0% (2000)

80% (2006)

50% (1977)

0% (1970)

50% (1977)

64% (1972)

0% (1950)