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 | 2007 | 10 |
| Non-citable documents | 2008 | 29 |
| Non-citable documents | 2009 | 30 |
| Non-citable documents | 2010 | 20 |
| Non-citable documents | 2011 | 1 |
| Non-citable documents | 2012 | 3 |
| Non-citable documents | 2013 | 6 |
| Non-citable documents | 2014 | 7 |
| Non-citable documents | 2015 | 7 |
| Non-citable documents | 2016 | 19 |
| Citable documents | 2007 | 44 |
| Citable documents | 2008 | 89 |
| Citable documents | 2009 | 138 |
| Citable documents | 2010 | 141 |
| Citable documents | 2011 | 132 |
| Citable documents | 2012 | 117 |
| Citable documents | 2013 | 127 |
| Citable documents | 2014 | 151 |
| Citable documents | 2015 | 173 |
| Citable documents | 2016 | 210 |