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 | 2010 | 12 |
| Non-citable documents | 2011 | 25 |
| Non-citable documents | 2012 | 35 |
| Non-citable documents | 2013 | 34 |
| Non-citable documents | 2014 | 21 |
| Non-citable documents | 2015 | 12 |
| Non-citable documents | 2016 | 4 |
| Citable documents | 2010 | 37 |
| Citable documents | 2011 | 70 |
| Citable documents | 2012 | 112 |
| Citable documents | 2013 | 106 |
| Citable documents | 2014 | 114 |
| Citable documents | 2015 | 128 |
| Citable documents | 2016 | 141 |