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 | 2009 | 1 |
| Non-citable documents | 2010 | 9 |
| Non-citable documents | 2011 | 14 |
| Non-citable documents | 2012 | 25 |
| Non-citable documents | 2013 | 21 |
| Non-citable documents | 2014 | 22 |
| Non-citable documents | 2015 | 16 |
| Non-citable documents | 2016 | 20 |
| Citable documents | 2009 | 5 |
| Citable documents | 2010 | 66 |
| Citable documents | 2011 | 115 |
| Citable documents | 2012 | 182 |
| Citable documents | 2013 | 164 |
| Citable documents | 2014 | 170 |
| Citable documents | 2015 | 172 |
| Citable documents | 2016 | 185 |