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 | 1999 | 0 |
| Non-citable documents | 2000 | 0 |
| Non-citable documents | 2001 | 0 |
| Non-citable documents | 2002 | 7 |
| Non-citable documents | 2003 | 12 |
| Non-citable documents | 2004 | 15 |
| Non-citable documents | 2005 | 8 |
| Non-citable documents | 2006 | 4 |
| Non-citable documents | 2007 | 5 |
| Non-citable documents | 2008 | 5 |
| Non-citable documents | 2009 | 4 |
| Non-citable documents | 2010 | 0 |
| Non-citable documents | 2011 | 0 |
| Non-citable documents | 2012 | 5 |
| Non-citable documents | 2013 | 5 |
| Non-citable documents | 2014 | 5 |
| Non-citable documents | 2015 | 0 |
| Non-citable documents | 2016 | 0 |
| Non-citable documents | 2017 | 0 |
| Non-citable documents | 2018 | 0 |
| Non-citable documents | 2019 | 0 |
| Non-citable documents | 2020 | 0 |
| Citable documents | 1999 | 616 |
| Citable documents | 2000 | 608 |
| Citable documents | 2001 | 593 |
| Citable documents | 2002 | 596 |
| Citable documents | 2003 | 573 |
| Citable documents | 2004 | 553 |
| Citable documents | 2005 | 542 |
| Citable documents | 2006 | 532 |
| Citable documents | 2007 | 555 |
| Citable documents | 2008 | 545 |
| Citable documents | 2009 | 543 |
| Citable documents | 2010 | 538 |
| Citable documents | 2011 | 557 |
| Citable documents | 2012 | 543 |
| Citable documents | 2013 | 518 |
| Citable documents | 2014 | 492 |
| Citable documents | 2015 | 492 |
| Citable documents | 2016 | 504 |
| Citable documents | 2017 | 511 |
| Citable documents | 2018 | 518 |
| Citable documents | 2019 | 497 |
| Citable documents | 2020 | 483 |