| Month | Number of messages |
|---|---|
| 2015 November | 1 |
| 2014 August | 1 |
| 2014 June | 5 |
| 2014 March | 3 |
| 2014 February | 1 |
| 2013 June | 4 |
| 2013 April | 2 |
| 2013 March | 1 |
| 2012 November | 2 |
| 2012 October | 4 |
| 2012 September | 28 |
| 2012 August | 17 |
| 2012 July | 6 |
| 2012 June | 4 |
| 2012 May | 10 |
| 2012 April | 5 |
| 2012 March | 4 |
| 2012 January | 9 |
| 2011 December | 2 |
| 2011 November | 1 |
| 2011 October | 1 |
| 2011 August | 2 |
| 2011 July | 5 |
| 2011 June | 2 |