Table 4: Evolution of found criteria from 1995 to 2006.

From 1995 to 1999 ( )2000 ( )2001 ( )2002 ( )2003 ( )2004 ( )2005 ( )2006 ( )

1 [ ]1 [ ]1 [ ]1 [ ]2 [ ]1 [ ]3 [ ]5 [ ]