| YEAR | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual 24-hr Avg. |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1990 | 286 | 301 | 423 | 485 | 658 | 927 | 1010 | 959 | 826 | 650 | 384 | 256 | 599 |
| 1991 | 238 | 339 | 432 | 463 | 675 | 999 | 1285 | 1270 | 991 | 790 | 391 | 321 | 685 |
| 1992 | 309 | 387 | 485 | 530 | 780 | 990 | 1291 | 1345 | 1094 | 895 | 454 | 302 | 742 |
| 1993 | 277 | 340 | 476 | 507 | 780 | 1035 | 1338 | 1476 | 1124 | 814 | 446 | 360 | 751 |
| 1994 | 350 | 371 | 514 | 552 | 845 | 1044 | 1350 | 1489 | 1146 | 736 | 440 | 353 | 769 |
| 1995 | 340 | 390 | 471 | 548 | 817 | 1264 | 1034 | 797 | 480 | ||||
| 1996 | 237 | 468 | 569 | 724 | 984 | 1335 | 867 | 726 | 401 | 310 | |||
| 1997 | 246 | 370 | 422 | 471 | 669 | 994 | 1263 | 1347 | 928 | 746 | 463 | 333 | 688 |
| 1998 | 302 | 421 | 479 | 538 | 752 | 1004 | 1249 | 985 | 995 | 674 | 428 | 324 | 679 |
| 1999 | 332 | 372 | 491 | 553 | 724 | 966 | 1236 | 1246 | 940 | 691 | 467 | 347 | 697 |
| 2000 | 336 | 404 | 503 | 567 | 777 | 1106 | 1307 | 989 | 853 | 680 | 435 | 314 | 689 |
| 2001 | 329 | 362 | 481 | 510 | 832 | 1120 | 1313 | 1222 | 985 | 649 | 473 | 316 | 716 |
| 2002 | 315 | 392 | 436 | 520 | 792 | 1078 | 1331 | 1232 | 972 | 743 | 454 | 368 | 719 |
| 2003 | 343 | 386 | 438 | 522 | 764 | 1068 | 1220 | 1253 | 1008 | 712 | 388 | 323 | 702 |
| 2004 | 286 | 396 | 497 | 581 | 803 | 1063 | 1165 | 1073 | 883 | 676 | 448 | 330 | 683 |
| 2005 | 304 | 411 | 454 | 499 | 749 | 958 | 1113 | 1032 | 816 | 603 | 385 | 276 | 633 |
| 2006 | 325 | 362 | 451 | 503 | 692 | 912 | 1014 | 937 | 825 | 632 | 367 | 277 | 608 |
| 2007 | 271 | 332 | 440 | 496 | 608 | 891 | 1023 | 1006 | 820 | 602 | 377 | 265 | 594 |
| 2008 | 232 | 201 | 392 |
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