| Month | Number of messages |
|---|---|
| 2018 November | 1 |
| 2018 January | 2 |
| 2017 August | 2 |
| 2017 March | 16 |
| 2016 November | 3 |
| 2016 September | 1 |
| 2016 August | 3 |
| 2016 June | 1 |
| 2016 May | 1 |
| 2016 April | 5 |
| 2016 January | 8 |
| 2015 December | 1 |
| 2015 November | 4 |
| 2015 October | 4 |
| 2015 September | 6 |
| 2015 August | 5 |
| 2015 July | 4 |
| 2015 June | 1 |
| 2015 May | 2 |