| Year | Jan | Feb | Mar | Apr | May | June | July | Aug | Sept | Oct | Nov | Dec |
| 2006 | n/a | n/a | 283 | 582 | 403 | 357 | 307 | 375 | 571 | 565 | 544 | 465 |
| 2007 | 572 | 362 | 215 | 514 | 270 | 332 | 86 | 443 | 542 | 471 | 405 | 325 |
| 2008 | 491 | 412 | 615 | 413 | 439 | 304 | 448 | 350 | 523 | 115 | 537 | 441 |
| 2009 | 13 | 593 | 475 | 423 | 190 | 365 | 384 | 165 | 599 | 515 | 124 | n/a |