| Year | Qtr | # Shares | Change |
|---|---|---|---|
| 2013 | Q1 | 458,170,323 | +34,312,462 |
| 2012 | Q4 | 423,857,861 | +1,308,316 |
| 2012 | Q3 | 422,549,545 | +11,504,300 |
| 2012 | Q2 | 411,045,245 | +16,710,317 |
| 2012 | Q1 | 394,334,928 | +10,631,300 |
| 2011 | Q4 | 383,703,628 | +22,333,820 |
| 2011 | Q3 | 361,369,808 | +9,042,200 |
| 2011 | Q2 | 352,327,608 | +9,703,683 |
| 2011 | Q1 | 342,623,925 | |
| 2010 | Q4 | 342,623,925 | +6,215,080 |
| 2010 | Q3 | 336,408,845 |