| YEAR | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual 24-hr Avg. |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1990 | 242 | 274 | 323 | 382 | 649 | 962 | 1361 | 1252 | 860 | 485 | 308 | 226 | 613 |
| 1991 | 228 | 300 | 323 | 313 | 567 | 986 | 1340 | 1298 | 999 | 590 | 277 | 204 | 621 |
| 1992 | 258 | 301 | 342 | 399 | 689 | 1039 | 1386 | 1360 | 957 | 601 | 330 | 281 | 665 |
| 1993 | 244 | 321 | 369 | 413 | 726 | 1103 | 1491 | 1428 | 1050 | 657 | 351 | 303 | 708 |
| 1994 | 309 | 322 | 375 | 413 | 702 | 1088 | 1580 | 1368 | 1073 | 660 | 353 | 349 | 719 |
| 1995 | 280 | 357 | 376 | 385 | 658 | 1068 | 1485 | 1445 | 1120 | 599 | 293 | 416 | 707 |
| 1996 | 289 | 327 | 388 | 393 | 660 | 1052 | 1454 | 1426 | 1103 | 609 | 365 | 323 | 699 |
| 1997 | 314 | 374 | 421 | 392 | 612 | 906 | 1377 | 1366 | 1028 | 631 | 400 | 347 | 681 |
| 1998 | 296 | 367 | 400 | 432 | 683 | 946 | 1405 | 1438 | 1086 | 370 | 344 | 359 | 677 |
| 1999 | 313 | 447 | 396 | 630 | 937 | 1271 | 1230 | 923 | 586 | 380 | 361 | ||
| 2000 | 338 | 365 | 387 | 416 | 639 | 952 | 1243 | 1154 | 940 | 598 | 367 | 349 | 646 |
| 2001 | 323 | 357 | 380 | 402 | 630 | 952 | 1232 | 1296 | 878 | 582 | 390 | 302 | 644 |
| 2002 | |||||||||||||
| 2003 | 472 | 391 | 343 | ||||||||||
| 2004 | 319 | 378 | 388 | 406 | 601 | 872 | 1150 | 1048 | 922 | 587 | 397 | 386 | 621 |
| 2005 | 313 | 362 | 370 | 403 | 637 | 860 | 1179 | 1043 | 824 | 546 | 390 | 333 | 605 |
| 2006 | 315 | 400 | 386 | 402 | 584 | 842 | 1104 | 974 | 962 | 564 | 396 | 381 | 609 |
| 2007 | 315 | 436 | 402 | 409 | 612 | 748 | 1047 | 978 | 726 | 466 | 352 | 330 | 568 |
| 2008 | 288 | 314 | 528 | 710 | 881 | 886 | 835 | 575 | 383 | 346 | |||
| 2009 | 335 | 398 | 366 | 397 | 606 | 788 | 970 | 887 |
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