Not every article in a journal is considered primary research and therefore "citable", this chart shows the ratio of a journal's articles including substantial research (research articles, conference papers and reviews) in three year windows vs. those documents other than research articles, reviews and conference papers.
| Documents | Year | Value |
| Non-citable documents | 1999 | 0 |
| Non-citable documents | 2000 | 0 |
| Non-citable documents | 2007 | 12 |
| Non-citable documents | 2008 | 21 |
| Non-citable documents | 2009 | 27 |
| Non-citable documents | 2010 | 15 |
| Non-citable documents | 2011 | 6 |
| Non-citable documents | 2012 | 3 |
| Non-citable documents | 2013 | 3 |
| Non-citable documents | 2014 | 3 |
| Non-citable documents | 2015 | 0 |
| Non-citable documents | 2016 | 0 |
| Citable documents | 1999 | 4 |
| Citable documents | 2000 | 4 |
| Citable documents | 2007 | 108 |
| Citable documents | 2008 | 192 |
| Citable documents | 2009 | 297 |
| Citable documents | 2010 | 285 |
| Citable documents | 2011 | 301 |
| Citable documents | 2012 | 294 |
| Citable documents | 2013 | 288 |
| Citable documents | 2014 | 280 |
| Citable documents | 2015 | 268 |
| Citable documents | 2016 | 269 |