| Year | 2001 | 2002 | 2003 | 2004 | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 | 2012 | 2013 | 2014 | 2015 | Total |
| Quantity of articles per year | 11 | 07 | 11 | 06 | 08 | 07 | 08 | 13 | 12 | 10 | 08 | 09 | 08 | 11 | 13 | 142 |