| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2008 | 0 | 0 | 0 | 0 | 0 | 0 | 140 | 1143 | 610 | 710 | 606 | 629 |
| 2009 | 449 | 420 | 491 | 456 | 362 | 533 | 478 | 423 | 386 | 330 | 314 | 252 |
| 2010 | 178 | 204 | 254 | 258 | 243 | 355 | 347 | 389 | 360 | 322 | 290 | 281 |
| 2011 | 365 | 420 | 420 | 544 | 431 | 564 | 625 | 734 | 653 | 566 | 621 | 474 |
| 2012 | 584 | 609 | 711 | 622 | 771 | 671 | 501 | 679 | 498 | 628 | 547 | 447 |
| 2013 | 490 | 471 | 544 | 541 | 434 | 453 | 428 | 421 | 358 | 431 | 451 | 369 |
| 2014 | 470 | 433 | 497 | 550 | 565 | 590 | 600 | 442 | 171 | 158 | 149 | 134 |
| 2015 | 170 | 145 | 154 | 171 | 234 | 369 | 277 | 363 | 194 | 200 | 219 | 232 |
| 2016 | 246 | 159 | 207 | 163 | 149 | 209 | 290 | 330 | 196 | 162 | 195 | 172 |
| 2017 | 216 | 189 | 195 | 179 | 314 | 453 | 696 | 992 | 626 | 554 | 518 | 423 |
| 2018 | 496 | 446 | 669 | 276 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |