40% (1978)

0% (1976)

33% (2000)

58% (1970)

0% (1979)

53% (1999)

60% (1977)

30% (1977)

60% (1987)

40% (1998)

60% (1977)

0% (2000)

0% (2001)

0% (2006)

50% (1997)

45% (1978)

60% (1997)

0% (2006)

20% (1994)

70% (1977)