| Session 1 (Web Conference, 19 December 2014) | 1 | 2014-12-19 |
| Session 2 (Web conference, 9 February 2015) | 2 | 2015-02-09 |
| Session 3 (Geneva, 10 March 2015) | 3 | 2015-03-10 |
| Session 4 (Berlin, 15 June 2015) | 4 | 2015-06-15 |
| Session 5 (Geneva, 24 June 2015) | 5 | 2015-06-24 |
| Session 6 (Geneva, 3 November 2015) | 6 | 2015-11-03 |
| Session 7 (Geneva, 11 November 2015) | 7 | 2015-11-11 |
| Session 8 (Geneva, 9 March 2016) | 8 | 2016-03-09 |
| Session 9 (Geneva, 22 June 2016) | 9 | 2016-06-22 |
| Session 10 (Geneva, 16 November 2016) | 10 | 2016-11-16 |
| Session 11 (Geneva, 16 March 2017) | 11 | 2017-03-16 |
| Session 12 (Geneva, 22 June 2017) | 12 | 2017-06-22 |
| Session 13 (Geneva, 16 November 2017) | 13 | 2017-11-16 |
| Session 14 (Geneva, 15 March 2018) | 14 | 2018-03-15 |
| Session 15 (Geneva, 21 June 2018) | 15 | 2018-06-21 |