| Subject | Jan-08 | Dec-08 | Jan-09 | Growth, YTY |
| 1 word | 20.96% | 20.70% | 20.29% | -3% |
| 2 words | 24.91% | 24.13% | 23.65% | -5% |
| 3 words | 22.03% | 21.94% | 21.92% | 0% |
| 4 words | 14.54% | 14.67% | 14.89% | 2% |
| 5 words | 8.20% | 8.37% | 8.68% | 6% |
| 6 words | 4.32% | 4.47% | 4.65% | 8% |
| 7 words | 2.23% | 2.40% | 2.49% | 12% |
| 8+ words | 2.81% | 3.31% | 3.43% | 22% |
| Source: Hitwise | ||||