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 | 11 |
| Non-citable documents | 2011 | 20 |
| Non-citable documents | 2012 | 28 |
| Non-citable documents | 2013 | 22 |
| Non-citable documents | 2014 | 16 |
| Non-citable documents | 2015 | 10 |
| Non-citable documents | 2016 | 7 |
| Citable documents | 2010 | 77 |
| Citable documents | 2011 | 138 |
| Citable documents | 2012 | 217 |
| Citable documents | 2013 | 215 |
| Citable documents | 2014 | 249 |
| Citable documents | 2015 | 319 |
| Citable documents | 2016 | 352 |