20% (1985)

70% (1996)

44% (1988)

20% (2000)

0% (1997)

0% (1992)

0% (1973)

60% (1979)

38% (1995)

0% (1956)

50% (1983)

50% (2000)

50% (2002)

50% (2000)

0% (2003)

0% (1996)

70% (1995)

0% (1973)

40% (2000)

0% (1979)