| Year | Volume | Number |
|---|---|---|
| 2024 | 36 | 5 articles |
| 2023 | 35 | 39 articles |
| 2022 | 34 | 29 articles |
| 2021 | 33 | 49 articles |
| 2020 | 32 | 64 articles |
| 2019 | 31 | 52 articles |
| 2018 | 30 | 58 articles |
| 2017 | 29 | 65 articles |
| 2016 | 28 | 1 2 3 |
| 2015 | 27 | 1 2 3 |
| 2014 | 26 | 1 2 3 special issue special issue 2 |
| 2013 | 25 | 1 2 3 special issue special issue 2 |
| 2012 | 24 | 1 2 3 special issue |
| 2011 | 23 | 1 2 3 special issue |
| 2010 | 22 | 1 2 3 |
| 2009 | 21 | 1 2 3 special issue |
| 2008 | 20 | 1 2 3 special issue |
| 2007 | 19 | 1 2 3 special issue special issue 2 |
| 2006 | 18 | 1 2 3 |
| 2005 | 17 | 1 2 3 |
| 2004 | 16 | 1 2 3 |
| 2003 | 15 | 1 2 |
| 2002 | 14 | 1 2 |
