| Date | Share Price | |
| Feb-00 | $31.00 | |
| Jun-00 | $44.06 | |
| Oct-00 | $54.35 | |
| Feb-01 | $44.70 | |
| Jun-01 | $55.81 | |
| Oct-01 | $67.92 | |
| Feb-02 | $64.95 | |
| Jun-02 | $57.34 | |
| Nov-02 | $44.04 | |
| Feb-03 | $43.86 | |
| Jun-03 | $49.67 | |
| Oct-03 | $53.39 | |
| Feb-04 | $51.49 | |
| Jun-04 | $52.38 | |
| Oct-04 | $52.30 | |
| Feb-05 | $43.75 | |
| Jun-05 | $52.92 | |
| Oct-05 | $49.52 | |
| Feb-06 | $48.17 | |
| Jun-06 | $49.79 | |
| Oct-06 | $48.56 | |
| Feb-07 | $44.67 | |
| Jun-07 | $70.71 | |
| Oct-07 | $101.37 | |
| Feb-08 | $129.85 | |
| Jun-08 | $168.03 | |
| Oct-08 | $209.73 | |
| Feb-09 | $184.70 | |
| Jun-09 | $124.64 | |
| Oct-09 | $79.09 | |
| Feb-10 | $71.53 | |
| Jun-10 | $82.90 | |
| Oct-10 | $98.48 | |
| Feb-11 | $137.98 | |
| Jun-11 | $133.23 | $16,163,464 |