| YEAR | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual 24-hr Avg. |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1990 | 280 | 297 | 409 | 413 | 452 | 519 | 592 | 547 | 504 | 498 | 421 | 271 | 434 |
| 1991 | 241 | 280 | 363 | 378 | 478 | 539 | 633 | 582 | 510 | 574 | 424 | 308 | 444 |
| 1992 | 287 | 332 | 405 | 406 | 486 | 534 | 654 | 582 | 553 | 661 | 483 | 304 | 476 |
| 1993 | 255 | 266 | 391 | 485 | 474 | 485 | 609 | 568 | 545 | 611 | 466 | 325 | 458 |
| 1994 | 297 | 297 | 421 | 448 | 521 | 579 | 641 | 604 | 661 | 668 | 481 | 395 | 502 |
| 1995 | 356 | 361 | 426 | 520 | 564 | 685 | 722 | 669 | 697 | 536 | 408 | ||
| 1996 | 295 | 319 | 410 | 443 | 478 | 515 | 633 | 619 | 573 | 607 | 504 | 346 | 479 |
| 1997 | 301 | 358 | 421 | 422 | 505 | 538 | 660 | 641 | 578 | 647 | 534 | 385 | 499 |
| 1998 | 309 | 364 | 435 | 464 | 516 | 586 | 704 | 696 | 636 | 610 | 539 | 369 | 519 |
| 1999 | 340 | 357 | 455 | 457 | 526 | 589 | 749 | 714 | 661 | 630 | 586 | 393 | 538 |
| 2000 | 341 | 391 | 450 | 545 | 567 | 606 | 738 | 637 | 642 | 637 | 532 | 388 | 540 |
| 2001 | 366 | 359 | 447 | 475 | 560 | 638 | 708 | 707 | 646 | 679 | 643 | 379 | 551 |
| 2002 | 323 | 375 | 536 | 520 | 693 | 724 | 552 | 425 | |||||
| 2003 | 377 | 368 | 607 | 588 | 681 | 678 | 603 | 711 | 530 | 388 | |||
| 2004 | 333 | 367 | 499 | 502 | 557 | 601 | 701 | 677 | 657 | 682 | 540 | 384 | 542 |
| 2005 | 317 | 391 | 502 | 469 | 553 | 568 | 711 | 687 | 591 | 614 | 519 | 362 | 524 |
| 2006 | 318 | 352 | 478 | 455 | 496 | 598 | 660 | 591 | 581 | 638 | 525 | 378 | 506 |
| 2007 | 321 | 357 | 460 | 457 | 517 | 574 | 642 | 619 | 618 | 638 | 530 | 336 | 506 |
| 2008 | 295 | 301 | 430 | 422 | 493 | 507 | 575 | 551 | 558 | 606 | 527 | 326 | 466 |
| 2009 | 293 | 327 | 420 | 425 | 528 | 583 | 658 | 580 | 647 |
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