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| Date | Max Price | Avg Price | # Prices |
|---|---|---|---|
| 2012-02-04 | $19.63 | $8.73 | 26 |
| 2012-02-01 | $18.64 | $7.43 | 14 |
| 2012-01-28 | $20.25 | $8.27 | 9 |
| 2012-01-24 | $28.25 | $12.84 | 15 |
| 2012-01-23 | $35.39 | $18.29 | 13 |
| 2012-01-21 | $31.25 | $27.50 | 4 |
| 2012-01-20 | $35.39 | $21.49 | 11 |
| 2012-01-16 | $27.75 | $25.19 | 4 |
| 2012-01-12 | $28.50 | $24.61 | 4 |
| 2012-01-05 | $15.75 | $14.75 | 3 |
| 2012-01-04 | $15.75 | $15.75 | 1 |
| 2012-01-02 | $15.75 | $14.62 | 4 |
| 2011-12-31 | $23.22 | $16.24 | 4 |
| 2011-12-27 | $30.62 | $25.67 | 4 |
| 2011-12-25 | $36.74 | $17.88 | 12 |
| 2011-12-18 | $15.75 | $8.84 | 4 |
| 2011-12-16 | $35.76 | $9.80 | 11 |
| 2011-12-15 | $35.76 | $9.89 | 11 |
| 2011-12-03 | $15.75 | $12.97 | 2 |
| 2011-11-23 | $35.76 | $17.12 | 9 |
| 2011-11-19 | $22.03 | $14.39 | 3 |
| 2011-11-18 | $23.18 | $13.36 | 3 |
| 2011-11-17 | $23.18 | $13.36 | 3 |
| 2011-11-16 | $23.18 | $16.09 | 2 |
| 2011-11-15 | $23.18 | $16.09 | 2 |
| 2011-11-14 | $19.50 | $14.25 | 2 |
| 2011-11-08 | $29.07 | $18.99 | 3 |
| 2011-11-04 | $29.07 | $20.56 | 5 |
| 2011-10-30 | $38.92 | $13.25 | 10 |
| 2011-10-28 | $38.92 | $15.88 | 10 |
| 2011-10-24 | $38.92 | $13.31 | 18 |
| 2011-10-23 | $29.07 | $11.24 | 9 |
| 2011-10-19 | $23.00 | $12.43 | 19 |
| 2011-10-18 | $23.00 | $13.65 | 13 |
| 2011-10-16 | $13.13 | $9.63 | 7 |
| 2011-10-14 | $13.80 | $9.10 | 7 |
| 2011-10-12 | $22.85 | $8.97 | 13 |
| 2011-10-09 | $22.85 | $6.73 | 8 |
| 2011-10-05 | $22.85 | $6.92 | 12 |
| 2011-09-14 | $10.00 | $7.76 | 4 |
| 2011-06-02 | $36.10 | $20.73 | 11 |
| 2011-05-14 | $38.70 | $18.19 | 13 |
| 2011-03-11 | $30.00 | $11.79 | 11 |
| 2011-02-13 | $36.99 | $17.45 | 78 |
| 2011-02-09 | $48.05 | $21.34 | 585 |
| 2011-01-07 | $48.38 | $28.59 | 13 |
| 2011-01-04 | $48.38 | $27.50 | 42 |
| 2011-01-03 | $48.38 | $27.09 | 14 |
| 2010-12-21 | $48.38 | $26.77 | 14 |
| 2010-12-20 | $49.20 | $27.08 | 95 |
| 2010-12-18 | $48.38 | $28.15 | 13 |
| 2010-12-16 | $48.38 | $29.54 | 13 |
| 2010-12-05 | $31.00 | $31.00 | 1 |
| 2010-09-09 | $40.31 | $26.66 | 13 |
| 2010-09-02 | $40.17 | $27.68 | 91 |
| 2010-08-28 | $38.27 | $28.24 | 15 |
| 2010-08-25 | $38.69 | $29.03 | 50 |
| 2010-07-27 | $37.00 | $27.38 | 15 |
| 2010-07-09 | $37.07 | $25.68 | 16 |
| 2010-04-06 | $32.20 | $17.78 | 25 |
| 2010-01-09 | $37.80 | $22.67 | 26 |
| 2009-12-09 | $37.87 | $22.99 | 29 |
| 2009-08-17 | $33.00 | $24.62 | 27 |
| 2009-08-13 | $33.20 | $24.55 | 28 |
| 2009-07-31 | $31.00 | $22.43 | 28 |
| 2009-07-04 | $30.30 | $21.66 | 28 |
| 2009-01-03 | $37.27 | $25.48 | 22 |