53% (1997)

0% (1999)

70% (2005)

49% (1992)

10% (1991)

48% (1996)

0% (2002)

17% (2003)

45% (1999)

60% (1992)

31% (2006)

0% (2005)

60% (1990)

0% (1970)

38% (2008)