| Year of publication | Number of articles | Proposition |
| 2006 | 01 | 1.5 |
| 2007 | 02 | 2.9 |
| 2008 | 04 | 5.9 |
| 2009 | 04 | 5.9 |
| 2010 | 04 | 5.9 |
| 2011 | 05 | 7.4 |
| 2012 | 08 | 11.8 |
| 2013 | 07 | 10.3 |
| 2014 | 02 | 2.9 |
| 2015 | 07 | 10.3 |
| 2016 | 03 | 4.3 |
| 2017 | 11 | 16.2 |
| 2018 | 10 | 14.7 |
| Total | 68 | 100 |