| Date | Tier 1 | Tier 2 | Tier 3 | T1 increase | T2 increase | T3 increase |
| 06-Jul-07 | $3.80 | $0.65 | $0.05 | - | - | - |
| 06-Aug-07 | $5.99 | $1.03 | $0.06 | 57.63% | 58.46% | 20.00% |
| 07-Sep-07 | $4.67 | $0.79 | $0.06 | -22.04% | -23.30% | 0.00% |
| 10-Oct-07 | $3.32 | $0.56 | $0.03 | -28.91% | -29.11% | -50.00% |
| 07-Nov-07 | $4.67 | $0.79 | $0.06 | 40.66% | 41.07% | 100.00% |
| 12-Dec-07 | $6.05 | $1.03 | $0.05 | 29.55% | 30.38% | -16.67% |
| average | 15.38% | 15.50% | 10.67% | |||
| 08-Jan-08 | $6.23 | $1.06 | $0.05 | 2.98% | 2.91% | 0.00% |
| 07-Feb-08 | $6.91 | $1.18 | $0.08 | 10.91% | 11.32% | 60.00% |
| 08-Mar-08 | $8.77 | $1.49 | $0.08 | 26.92% | 26.27% | 0.00% |
| 08-Apr-08 | $8.94 | $1.53 | $0.08 | 1.94% | 2.68% | 0.00% |
| 07-May-08 | $8.32 | $1.42 | $0.07 | -6.94% | -7.19% | -12.50% |
| 04-Jun-08 | $7.53 | $1.28 | $0.07 | -9.50% | -9.86% | 0.00% |
| 10-Jul-08 | $8.09 | $1.38 | $0.08 | 7.44% | 7.81% | 14.29% |
| 07-Aug-08 | $7.78 | $1.32 | $0.07 | -3.83% | -4.35% | -12.50% |
| 08-Sep-08 | $11.27 | $1.76 | $0.08 | 44.86% | 33.33% | 14.29% |
| 06-Oct-08 | $10.97 | $1.85 | $0.08 | -2.66% | 5.11% | 0.00% |
| 10-Nov-08 | $11.75 | $1.96 | $0.08 | 7.11% | 5.95% | 0.00% |
| 11-Dec-08 | $12.00 | $1.94 | $0.08 | 2.13% | -1.02% | 0.00% |
| average | 6.78% | 6.08% | 5.30% | |||
| 09-Jan-09 | $11.63 | $1.82 | $0.08 | -3.08% | -6.19% | 0.00% |
| 10-Feb-09 | $11.56 | $1.82 | $0.08 | -0.60% | 0.00% | 0.00% |
| 11-Mar-09 | $11.43 | $1.81 | $0.08 | -1.12% | -0.55% | 0.00% |
| 07-Apr-09 | $11.44 | $1.85 | $0.08 | 0.09% | 2.21% | 0.00% |
| 14-May-09 | $13.06 | $2.10 | $0.09 | 14.16% | 13.51% | 12.50% |
| 10-Jun-09 | $10.15 | $1.51 | $0.07 | -22.28% | -28.10% | -22.22% |
| 10-Jul-09 | $10.36 | $1.64 | $0.08 | 2.07% | 8.61% | 14.29% |
| 13-Aug-09 | $11.13 | $1.79 | $0.08 | 7.43% | 9.15% | 0.00% |
| 15-Sep-09 | $10.22 | $1.67 | $0.08 | -8.18% | -6.70% | 0.00% |
| 08-Oct-09 | $10.61 | $2.09 | $0.08 | 3.82% | 25.15% | 0.00% |
| 05-Nov-09 | $13.03 | $2.12 | $0.10 | 22.81% | 1.44% | 25.00% |
| 15-Dec-09 | $13.20 | $2.13 | $0.10 | 1.30% | 0.47% | 0.00% |
| average | 1.37% | 1.58% | 2.46% | |||
| 12-Jan-10 | $14.63 | $2.49 | $0.12 | 10.83% | 16.90% | 20.00% |
| 10-Feb-10 | $16.47 | $2.80 | $0.14 | 12.58% | 12.45% | 16.67% |
| 09-Mar-10 | $16.47 | $2.80 | $0.14 | 0.00% | 0.00% | 0.00% |
| 13-Apr-10 | $16.84 | $2.86 | $0.14 | 2.25% | 2.14% | 0.00% |
| 06-May-10 | $16.16 | $2.75 | $0.14 | -4.04% | -3.85% | 0.00% |
| 10-Jun-10 | $16.29 | $2.77 | $0.14 | 0.80% | 0.73% | 0.00% |
| 14-Jul-10 | $20.72 | $3.52 | $0.18 | 27.19% | 27.08% | 28.57% |
| average | 7.09% | 7.92% | 9.32% | |||