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 | 4 |
| Non-citable documents | 2011 | 14 |
| Non-citable documents | 2012 | 23 |
| Non-citable documents | 2013 | 30 |
| Non-citable documents | 2014 | 34 |
| Non-citable documents | 2015 | 25 |
| Non-citable documents | 2016 | 14 |
| Citable documents | 2010 | 14 |
| Citable documents | 2011 | 43 |
| Citable documents | 2012 | 80 |
| Citable documents | 2013 | 99 |
| Citable documents | 2014 | 104 |
| Citable documents | 2015 | 67 |
| Citable documents | 2016 | 34 |