| Basic Access Index | |
|---|---|
| 06/1/2010 | 82.80 |
| 07/1/2010 | 82.50 |
| 08/1/2010 | 82.40 |
| 09/1/2010 | 82.40 |
| 10/1/2010 | 82.20 |
| 11/1/2010 | 82.10 |
| 12/1/2010 | 81.70 |
| 01/1/2011 | 82.10 |
| 02/1/2011 | 82.40 |
| 03/1/2011 | 82.20 |
| 04/1/2011 | 82.10 |
| 05/1/2011 | 82.00 |
| 06/1/2011 | 82.00 |
| 07/1/2011 | 81.60 |
| 08/1/2011 | 81.90 |
| 09/1/2011 | 81.40 |
| 10/1/2011 | 81.20 |
| 11/1/2011 | 81.70 |
| 12/1/2011 | 81.80 |
| 01/1/2012 | 81.90 |