| YEAR | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual 24-hr Avg. |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1990 | 248 | 284 | 354 | 424 | 453 | 594 | 679 | 625 | 575 | 483 | 375 | 243 | 445 |
| 1991 | 243 | 295 | 348 | 379 | 437 | 564 | 709 | 708 | 560 | 521 | 354 | 297 | 452 |
| 1992 | 258 | 318 | 421 | 410 | 467 | 589 | 746 | 688 | 573 | 583 | 388 | 326 | 483 |
| 1993 | 211 | 250 | 369 | 467 | 453 | 543 | 713 | 704 | 579 | 594 | 411 | 298 | 467 |
| 1994 | 288 | 298 | 410 | 497 | 526 | 650 | 845 | 777 | 713 | 638 | 421 | 325 | 534 |
| 1995 | 309 | 338 | 406 | 470 | 498 | 627 | 815 | 828 | 688 | 677 | 471 | 364 | 541 |
| 1996 | 306 | 364 | 453 | 496 | 492 | 596 | 806 | 793 | 651 | 629 | 427 | 350 | 530 |
| 1997 | 354 | 394 | 492 | 495 | 518 | 612 | 816 | 746 | 649 | 630 | 481 | 379 | 547 |
| 1998 | 336 | 358 | 449 | 505 | 519 | 636 | 855 | 832 | 682 | 593 | 459 | 343 | 547 |
| 1999 | 348 | 342 | 462 | 495 | 520 | 619 | 851 | 820 | 685 | 591 | 501 | 360 | 550 |
| 2000 | 320 | 382 | 461 | 474 | 526 | 613 | 829 | 709 | 617 | 583 | 447 | 342 | 525 |
| 2001 | 299 | 325 | 450 | 502 | 547 | 638 | 816 | 782 | 660 | 610 | 508 | 340 | 540 |
| 2002 | 288 | 361 | 488 | 593 | 529 | 671 | 802 | 777 | 588 | 547 | 420 | 349 | 534 |
| 2003 | 302 | 330 | 489 | 536 | 548 | 689 | 839 | 851 | 667 | 617 | 445 | 359 | 556 |
| 2004 | 301 | 360 | 515 | 555 | 535 | 648 | 823 | 749 | 657 | 599 | 457 | 357 | 546 |
| 2005 | 293 | 352 | 474 | 559 | 521 | 654 | 871 | 763 | 636 | 565 | 426 | 367 | 540 |
| 2006 | 325 | 363 | 459 | 560 | 502 | 621 | 800 | 743 | 630 | 584 | 448 | 370 | 534 |
| 2007 | 339 | 372 | 499 | 550 | 571 | 675 | 792 | 786 | 684 | 633 | 491 | 371 | 564 |
| 2008 | 324 | 324 | 450 |
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