| Month | Number of messages |
|---|---|
| 2018 April | 8 |
| 2017 December | 1 |
| 2017 June | 2 |
| 2017 May | 4 |
| 2017 March | 1 |
| 2016 May | 2 |
| 2015 September | 1 |
| 2015 August | 1 |
| 2015 January | 2 |
| 2014 November | 6 |
| 2014 October | 4 |
| 2014 September | 24 |
| 2014 May | 30 |
| 2014 February | 1 |
| 2014 January | 19 |
| 2013 December | 18 |
| 2012 November | 3 |
| 2012 June | 1 |
| 2011 December | 1 |
| 2011 October | 10 |
| 2011 September | 2 |
| 2011 August | 11 |
| 2011 July | 5 |
| 2011 June | 5 |
| 2011 January | 1 |
| 2010 November | 1 |
| 2010 July | 23 |
| 2010 January | 11 |
| 2009 July | 3 |
| 2009 April | 5 |
| 2008 June | 1 |
| 2008 March | 9 |
| 2008 January | 2 |
| 2007 December | 1 |
| 2007 July | 4 |
| 2007 June | 16 |
| 2007 May | 4 |
| 2007 March | 5 |
| 2007 February | 47 |
| 2007 January | 8 |
| 2006 November | 9 |
| 2006 October | 3 |
| 2006 September | 1 |
| 2006 August | 5 |
| 2006 July | 5 |
| 2006 January | 2 |
| 2005 December | 6 |
| 2005 November | 8 |
| 2005 October | 3 |
| 2005 September | 32 |
| 2005 August | 18 |
| 2005 July | 23 |
| 2004 December | 7 |
| 2004 November | 35 |
| 2004 October | 29 |