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| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2010 | 592 | 551 | 657 | 637 | 638 | 777 | 592 | 625 | 38 | — | — | — |
| 2009 | 371 | 323 | 388 | 288 | 367 | 720 | 846 | 626 | 613 | 576 | 605 | 550 |
| 2008 | 489 | 386 | 501 | 653 | 333 | 422 | 1126 | 434 | 395 | 585 | 361 | 387 |
| 2007 | 257 | 284 | 404 | 399 | 292 | 178 | 262 | 450 | 395 | 548 | 696 | 594 |
| 2006 | — | — | — | — | — | 53 | 173 | 265 | 238 | 342 | 317 | 175 |