| YEAR | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual 24-hr Avg. |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1990 | 240 | 256 | 329 | 395 | 462 | 547 | 629 | 616 | 541 | 485 | 414 | 258 | 432 |
| 1991 | 247 | 326 | 354 | 393 | 470 | 561 | 633 | 633 | 550 | 485 | 340 | 309 | 442 |
| 1992 | 289 | 312 | 397 | 429 | 495 | 592 | 689 | 623 | 565 | 510 | 357 | 262 | 462 |
| 1993 | 195 | 225 | 322 | 348 | 469 | 610 | 693 | 683 | 614 | 510 | 389 | 298 | 448 |
| 1994 | 274 | 298 | 409 | 421 | 506 | 617 | 689 | 651 | 605 | 506 | 341 | 261 | 466 |
| 1995 | 298 | 318 | 352 | 411 | 491 | 625 | 708 | 681 | 640 | 548 | 443 | 350 | 489 |
| 1996 | 274 | 317 | 397 | 429 | 504 | 616 | 682 | 653 | 613 | 543 | 398 | 272 | 475 |
| 1997 | 288 | 341 | 412 | 408 | 512 | 752 | 754 | 731 | 628 | 540 | 435 | 328 | 511 |
| 1998 | 283 | 326 | 393 | 459 | 537 | 627 | 697 | 717 | 628 | 545 | 446 | 327 | 499 |
| 1999 | 324 | 308 | 401 | 433 | 521 | 782 | 744 | 697 | 653 | 581 | 505 | 337 | 524 |
| 2000 | 321 | 368 | 452 | 506 | 579 | 641 | 745 | 805 | 678 | 577 | 442 | 368 | 540 |
| 2001 | 333 | 336 | 417 | 499 | 588 | 644 | 733 | 694 | 654 | 578 | 494 | 290 | 522 |
| 2002 | 289 | 340 | 397 | 455 | 564 | 663 | 715 | 728 | 651 | 635 | 497 | 415 | 529 |
| 2003 | 392 | 441 | 447 | 472 | 585 | 688 | 777 | 733 | 653 | 596 | 474 | 398 | 555 |
| 2004 | 340 | 371 | 472 | 518 | 585 | 658 | 716 | 699 | 679 | 591 | 499 | 402 | 544 |
| 2005 | 313 | 388 | 430 | 483 | 562 | 631 | 710 | 667 | 605 | 526 | 442 | 342 | 508 |
| 2006 | 310 | 357 | 388 | 445 | 515 | 555 | 587 | 570 | 552 | 519 | 433 | 359 | 466 |
| 2007 | 352 | 383 | 413 | 452 | 536 | 581 | 631 | 650 | 591 | 538 | 464 | 344 | 495 |
| 2008 | 301 | 328 | 383 | 418 | 512 | 574 | 612 | 582 | 556 | 500 | 456 | 338 | 463 |
| 2009 | 323 | 321 | 365 | 440 | 568 | 572 | 603 | 598 | 592 |
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