| YEAR | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual 24-hr Avg. |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1990 | 254 | 287 | 414 | 508 | 672 | 948 | 1108 | 1090 | 834 | 588 | 377 | 249 | 613 |
| 1991 | 240 | 323 | 432 | 488 | 700 | 972 | 1202 | 1172 | 884 | 681 | 389 | 308 | 651 |
| 1992 | 294 | 387 | 516 | 531 | 787 | 980 | 1164 | 1220 | 920 | 654 | 420 | 332 | 687 |
| 1993 | 299 | 394 | 458 | 534 | 784 | 1008 | 1212 | 1204 | 906 | 681 | 409 | 333 | 687 |
| 1994 | 317 | 342 | 493 | 545 | 820 | 1041 | 1314 | 1206 | 947 | 684 | 388 | 285 | 701 |
| 1995 | 300 | 355 | 444 | 540 | 835 | 1097 | 1269 | 1212 | 962 | 759 | 438 | ||
| 1996 | 217 | 227 | 421 | 582 | 768 | 1210 | 1182 | 742 | 364 | 286 | |||
| 1997 | 265 | 360 | 415 | 487 | 741 | 953 | 1228 | 1209 | 869 | 627 | 441 | 318 | 659 |
| 1998 | 275 | 385 | 457 | 527 | 739 | 1008 | 1209 | 1152 | 940 | 624 | 411 | 302 | 669 |
| 1999 | 303 | 343 | 464 | 564 | 760 | 994 | 1227 | 1161 | 924 | 623 | 445 | 333 | 678 |
| 2000 | 325 | 379 | 479 | 583 | 800 | 1175 | 1242 | 848 | 809 | 580 | 395 | 295 | 659 |
| 2001 | 309 | 342 | 451 | 531 | 863 | 1026 | 1168 | 1172 | 919 | 598 | 459 | 285 | 677 |
| 2002 | 290 | 356 | 409 | 531 | 803 | 1052 | 1183 | 1159 | 873 | 624 | 405 | 324 | 667 |
| 2003 | 307 | 359 | 404 | 534 | 756 | 982 | 1158 | 1080 | 871 | 669 | 431 | 464 | 668 |
| 2004 | 270 | 369 | 477 | 580 | 804 | 968 | 1091 | 1021 | 846 | 611 | 414 | 294 | 645 |
| 2005 | 295 | 399 | 419 | 489 | 713 | 901 | 1036 | 1000 | 753 | 571 | 364 | 252 | 599 |
| 2006 | 276 | 323 | 417 | 492 | 687 | 864 | 968 | 918 | 756 | 547 | 346 | 248 | 570 |
| 2007 | 230 | 288 | 420 | 478 | 667 | 847 | 982 | 925 | 758 | 536 | 368 | 233 | 561 |
| 2008 | 202 | 168 | 350 |
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