| Month | Number of messages |
|---|---|
| 2018 May | 2 |
| 2018 April | 4 |
| 2018 March | 5 |
| 2018 January | 16 |
| 2017 October | 3 |
| 2017 June | 1 |
| 2016 June | 3 |
| 2015 December | 8 |
| 2015 November | 2 |
| 2015 October | 3 |
| 2015 September | 1 |
| 2015 February | 5 |
| 2014 September | 1 |
| 2014 January | 9 |
| 2013 September | 1 |
| 2013 July | 4 |
| 2011 June | 1 |
| 2011 April | 1 |
| 2011 March | 1 |
| 2011 January | 1 |
| 2010 August | 3 |
| 2008 October | 7 |
| 2008 July | 10 |
| 2008 April | 3 |
| 2008 February | 101 |
| 2008 January | 84 |
| 2007 November | 15 |
| 2007 May | 17 |
| 2007 April | 5 |
| 2007 March | 8 |
| 2007 January | 5 |
| 2006 October | 19 |
| 2006 July | 1 |
| 2006 June | 2 |
| 2006 March | 12 |
| 2006 February | 6 |
| 2006 January | 9 |
| 2005 December | 26 |
| 2005 November | 26 |
| 2005 October | 20 |
| 2005 September | 25 |
| 2005 August | 20 |
| 2005 July | 56 |
| 2005 June | 12 |
| 2005 May | 7 |
| 2005 April | 9 |
| 2004 December | 4 |
| 2004 November | 40 |
| 2004 October | 72 |
| 2004 September | 71 |
| 2004 August | 79 |
| 2004 July | 78 |
| 2004 June | 51 |
| 2004 May | 152 |
| 2004 April | 138 |
| 2004 March | 55 |
| 2004 February | 126 |
| 2004 January | 171 |
| 2003 December | 46 |