| Month | Number of messages |
|---|---|
| 2020 January | 2 |
| 2019 September | 6 |
| 2019 July | 2 |
| 2015 June | 3 |
| 2015 February | 2 |
| 2014 December | 12 |
| 2014 November | 1 |
| 2014 October | 3 |
| 2014 September | 1 |
| 2014 April | 8 |
| 2014 February | 3 |
| 2014 January | 4 |
| 2013 July | 5 |
| 2013 June | 5 |
| 2013 May | 33 |
| 2012 March | 1 |
| 2011 July | 1 |
| 2011 June | 5 |
| 2011 February | 2 |
| 2010 September | 4 |
| 2010 March | 2 |
| 2009 November | 1 |
| 2009 October | 9 |
| 2008 March | 3 |
| 2008 January | 15 |
| 2007 July | 2 |
| 2007 June | 5 |
| 2007 May | 12 |
| 2007 April | 2 |
| 2007 February | 2 |
| 2007 January | 5 |
| 2006 December | 7 |
| 2006 November | 4 |
| 2006 October | 2 |
| 2006 August | 7 |
| 2006 July | 9 |
| 2006 June | 2 |
| 2006 May | 5 |
| 2006 April | 1 |
| 2006 March | 11 |
| 2006 February | 7 |
| 2006 January | 5 |
| 2005 December | 26 |
| 2005 November | 11 |
| 2005 October | 7 |
| 2005 September | 34 |
| 2005 August | 4 |
| 2005 July | 7 |
| 2004 December | 8 |
| 2004 November | 5 |
| 2004 October | 29 |
| 2004 September | 7 |
| 2004 August | 16 |
| 2004 July | 9 |
| 2004 June | 27 |
| 2004 May | 13 |
| 2004 April | 17 |
| 2004 March | 23 |
| 2004 February | 59 |
| 2004 January | 20 |
| 2003 December | 20 |
| 2003 November | 15 |
| 2003 October | 44 |
| 2003 September | 4 |