Quarterly Sales Estimates for DWSN
| 03-2007 | 54.5 | 54.5 | 54.5 | 0 | 12/14/2006 |
| 06-2007 | 60.9 | 60.9 | 60.9 | 0 | 5/10/2007 |
| 09-2007 | 61.8 | 61.8 | 61.8 | 0 | 5/10/2007 |
| 12-2007 | 57.9 | 57.9 | 57.9 | 0 | 12/14/2006 |
| 03-2008 | 80.51 | 78.97 | 79.74 | 1.088 | 3/20/2008 |
| 06-2008 | 83.72 | 81.69 | 82.705 | 1.435 | 5/13/2008 |
| 09-2008 | 87.52 | 82.99 | 85.255 | 3.203 | 8/1/2008 |
| 12-2008 | 77.72 | 77.72 | 77.72 | 0 | 12/19/2008 |
| 03-2009 | 59.89 | 59.89 | 59.89 | 0 | 2/5/2009 |
| 06-2009 | 51.48 | 51.48 | 51.48 | 0 | 5/12/2009 |
| 09-2009 | 44.85 | 44.85 | 44.85 | 0 | 5/12/2009 |
| 12-2009 | 44.85 | 44.85 | 44.85 | 0 | 5/12/2009 |
| 03-2010 | 52.66 | 52.66 | 52.66 | 0 | 4/15/2010 |
| 06-2010 | 64.59 | 64.59 | 64.59 | 0 | 4/15/2010 |
| 09-2010 | 69.89 | 69.89 | 69.89 | 0 | 4/15/2010 |
| 12-2010 | 60.1 | 60.1 | 60.1 | 0 | 11/10/2010 |
| 03-2011 | 80.884 | 62.6 | 71.828 | 9.143 | 3/22/2011 |