| 2008 Part Year figures |
2009 | 2010 | 2011 | 2012 | 2013 | 2014 | 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | |
| Jan | 148 | 135 | 132 | 148 | 100 | 143 | 143 | 124 | 150 | 131 | 148 | 127 | ||
| Feb | 184 | 181 | 123 | 222 | 179 | 236 | 192 | 208 | 150 | 286 *** best ever | 263 | 199 | .||
| March | 422 | 365 | 392 | 399 | 214 | 419 | 367 | 423 | 324 | 286 | 340 | 419 | ||
| April | 480 | 554 | 530 | 449 | 450 | 455 | 508 | 445 | 487 | 369 lowest ever April | 484 | |||
| May | 538 | 498 | 541 | 470 | 508 | 499 | 481 | 544 | 488 | 584 Best ever May | 532 | |||
| June | 614 | 597 | 492 | 462 | 485 | 537 | 537 | 432 | 546 | 561 | 509 | |||
| July | 573 | 537 | 515 | 449 | 590 | 603 | 540 | 511 | 532. | 623 Best ever | 547 | |||
| August | 466 | 380 | 458 | 472 | 516 | 464 | 400 | 504 | 457 | 440 | 513 | |||
| Sept | 105 | 426 | 353 | 413 | 408 | 328 | 376 | 444 | 375 | 360 | 424 | 393 | ||
| October | 160 | 254 | 304> | 297 | 230 | 254 | 260 | 266 | 205 | 219 | 352 | 219 | ||
| November | 140 | 145 | 133 | 142 | 180 | 173 | 127 | 117 | 194 | 116 | 165 | 146 | ||
| December | 144 | 142 | 86 | 78 | 122 | 112 | 136 | 136 | 132 | 104 | 77 | 124 | ||
| Totals | 549 | 4392 | 4123 | 4113 | 4011 | 3992 | 4255 | 4178 | 4098 | 3933 | 4298 | 4218 |