| 03/10/2010 | - | 19.9% | 39.8% |
| 03/03/2010 | 03/09/2010 | 19.5% | 39.0% |
| 02/24/2010 | 03/02/2010 | 19.2% | 38.4% |
| 02/17/2010 | 02/23/2010 | 18.4% | 36.8% |
| 02/10/2010 | 02/16/2010 | 18.5% | 37.0% |
| 02/03/2010 | 02/09/2010 | 18.7% | 37.4% |
| 01/27/2010 | 02/02/2010 | 19.2% | 38.4% |
| 01/13/2010 | 01/26/2010 | 19.6% | 39.2% |
| 01/06/2010 | 01/12/2010 | 18.8% | 37.6% |
| 12/30/2009 | 01/05/2010 | 18.2% | 36.4% |
| 12/23/2009 | 12/29/2009 | 18.1% | 36.2% |
| 12/16/2009 | 12/22/2009 | 18.3% | 36.6% |
| 12/02/2009 | 12/15/2009 | 18.6% | 37.2% |
| 11/25/2009 | 12/01/2009 | 18.7% | 37.4% |
| 11/18/2009 | 11/24/2009 | 18.8% | 37.6% |
| 10/28/2009 | 11/17/2009 | 18.9% | 37.8% |
| 10/21/2009 | 10/27/2009 | 17.9% | 35.8% |
| 10/14/2009 | 10/20/2009 | 16.9% | 33.8% |
| 10/07/2009 | 10/13/2009 | 16.7% | 33.4% |
| 09/30/2009 | 10/06/2009 | 16.9% | 33.8% |
| 09/23/2009 | 09/29/2009 | 17.1% | 34.2% |
| 09/16/2009 | 09/22/2009 | 17.2% | 34.4% |
| 09/09/2009 | 09/15/2009 | 17.3% | 34.6% |
| 09/02/2009 | 09/08/2009 | 17.6% | 35.2% |
| 08/26/2009 | 09/01/2009 | 17.5% | 35.0% |
| 08/19/2009 | 08/25/2009 | 17.4% | 34.8% |
| 08/12/2009 | 08/18/2009 | 17.1% | 34.2% |
| 08/05/2009 | 08/11/2009 | 16.4% | 32.8% |
| 07/29/2009 | 08/04/2009 | 16.1% | 32.2% |
| 07/22/2009 | 07/28/2009 | 15.8% | 31.6% |
| 07/15/2009 | 07/21/2009 | 16.3% | 32.6% |
| 07/08/2009 | 07/14/2009 | 16.8% | 33.6% |
| 07/01/2009 | 07/07/2009 | 16.9% | 33.8% |
| 06/24/2009 | 06/30/2009 | 17.0% | 34.0% |
| 06/17/2009 | 06/23/2009 | 16.6% | 33.2% |
| 06/10/2009 | 06/16/2009 | 15.8% | 31.6% |
| 06/03/2009 | 06/09/2009 | 14.4% | 28.8% |
| 05/27/2009 | 06/02/2009 | 13.6% | 27.2% |
| 05/20/2009 | 05/26/2009 | 13.2% | 26.4% |
| 05/13/2009 | 05/19/2009 | 13.0% | 26.0% |
| 05/06/2009 | 05/12/2009 | 12.7% | 25.4% |
| 04/29/2009 | 05/05/2009 | 12.9% | 25.8% |
| 04/01/2009 | 04/28/2009 | 13.1% | 26.2% |
| 03/25/2009 | 03/31/2009 | 11.8% | 23.6% |
| 03/18/2009 | 03/24/2009 | 11.0% | 22.0% |
| 03/14/2009 | 03/17/2009 | 11.3% | 22.6% |