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 | 0 |
| Non-citable documents | 2009 | 2 |
| Non-citable documents | 2010 | 2 |
| Non-citable documents | 2011 | 4 |
| Non-citable documents | 2012 | 2 |
| Non-citable documents | 2013 | 2 |
| Non-citable documents | 2014 | 1 |
| Non-citable documents | 2015 | 1 |
| Non-citable documents | 2016 | 2 |
| Non-citable documents | 2017 | 1 |
| Non-citable documents | 2018 | 6 |
| Non-citable documents | 2019 | 9 |
| Non-citable documents | 2020 | 11 |
| Non-citable documents | 2021 | 7 |
| Citable documents | 2008 | 0 |
| Citable documents | 2009 | 21 |
| Citable documents | 2010 | 54 |
| Citable documents | 2011 | 85 |
| Citable documents | 2012 | 109 |
| Citable documents | 2013 | 131 |
| Citable documents | 2014 | 161 |
| Citable documents | 2015 | 214 |
| Citable documents | 2016 | 253 |
| Citable documents | 2017 | 240 |
| Citable documents | 2018 | 209 |
| Citable documents | 2019 | 195 |
| Citable documents | 2020 | 226 |
| Citable documents | 2021 | 239 |