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 | 2008 | 11 |
| Non-citable documents | 2009 | 17 |
| Non-citable documents | 2010 | 27 |
| Non-citable documents | 2011 | 29 |
| Non-citable documents | 2012 | 31 |
| Non-citable documents | 2013 | 25 |
| Non-citable documents | 2014 | 18 |
| Non-citable documents | 2015 | 25 |
| Non-citable documents | 2016 | 32 |
| Citable documents | 2008 | 65 |
| Citable documents | 2009 | 132 |
| Citable documents | 2010 | 208 |
| Citable documents | 2011 | 236 |
| Citable documents | 2012 | 219 |
| Citable documents | 2013 | 169 |
| Citable documents | 2014 | 127 |
| Citable documents | 2015 | 131 |
| Citable documents | 2016 | 153 |