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 | 8 |
| Non-citable documents | 2010 | 17 |
| Non-citable documents | 2011 | 24 |
| Non-citable documents | 2012 | 23 |
| Non-citable documents | 2013 | 21 |
| Non-citable documents | 2014 | 26 |
| Non-citable documents | 2015 | 37 |
| Non-citable documents | 2016 | 40 |
| Citable documents | 2009 | 50 |
| Citable documents | 2010 | 102 |
| Citable documents | 2011 | 171 |
| Citable documents | 2012 | 192 |
| Citable documents | 2013 | 213 |
| Citable documents | 2014 | 227 |
| Citable documents | 2015 | 219 |
| Citable documents | 2016 | 222 |