| YEAR | JAN | FEB | MAR | APR | MAY | JUN | JULY | AUG | SEP | OCT | NOV | DEC | YEARLY TOTAL |
| 1980 | 23,700 | 22,800 | 23,500 | 19,300 | 27,300 | 21,100 | 18,100 | 27,000 | 24,200 | 21,100 | 25,900 | 20,500 | 274,500 |
| 1981 | 20,700 | 18,600 | 16,800 | 21,100 | 24,800 | 15,100 | 13,200 | 18,900 | 17,900 | 22,400 | 14,400 | 15,400 | 219,300 |
| 1982 | 13,300 | 14,800 | 12,800 | 12,200 | 15,900 | 11,900 | 10,100 | 10,000 | 12,900 | 13,600 | 11,000 | 11,100 | 149,600 |
| 1983 | 9,200 | 7,700 | 7,600 | 10,500 | 8,900 | 7,200 | 6,200 | 7,500 | 9,100 | 10,100 | 7,000 | 8,300 | 99,300 |
| 1984 | 7,200 | 7,100 | 7,800 | 7,400 | 9,600 | 11,000 | 6,700 | 7,700 | 9,100 | 9,400 | 9,500 | 12,800 | 105,300 |
| 1985 | 6,400 | 6,500 | 7,700 | 7,700 | 10,200 | 15,000 | 10,100 | 15,300 | 14,100 | 8,600 | 13,400 | 11,500 | 126,500 |
| 1986 | 12,600 | 11,800 | 15,800 | 14,000 | 20,700 | 21,700 | 11,200 | 20,100 | 17,700 | 16,600 | 17,000 | 22,600 | 201,800 |
| 1987 | 19,330 | 20,100 | 19,600 | 21,900 | 27,900 | 21,900 | 17,500 | 25,900 | 23,300 | 28,200 | 24,400 | 22,700 | 272,730 |
| 1988 | 21,400 | 23,300 | 24,600 | 32,500 | 27,000 | 26,200 | 25,900 | 23,300 | 26,100 | 33,400 | 27,200 | 33,600 | 324,500 |
| 1989 | 27,600 | 25,900 | 28,700 | 35,900 | 28,300 | 25,100 | 27,200 | 26,500 | 35,500 | 28,100 | 32,700 | 26,900 | 348,400 |
| 1990 | 25,100 | 27,000 | 35,000 | 26,700 | 26,300 | 29,600 | 24,400 | 26,700 | 35,100 | 28,200 | 28,500 | 32,600 | 345,200 |
| 1991 | 26,400 | 26,700 | 29,000 | 7,100 | 19,900 | 27,100 | 18,000 | 26,200 | 23,600 | 25,000 | 22,600 | 25,300 | 276,900 |
| 1992 | 20,200 | 24,900 | 15,400 | 19,700 | 24,000 | 18,400 | 15,900 | 24,900 | 19,900 | 25,000 | 18,500 | 18,600 | 245,400 |
| 1993 | 11,758 | 14,037 | 13,169 | 13,706 | 17,562 | 13,602 | 15,028 | 10,646 | 13,434 | 16,881 | 12,236 | 11,861 | 163,920 |
| 1994 | 5,141 | 7,649 | 7,796 | 9,753 | 8,700 | 8,696 | 9,106 | 7,987 | 9,618 | 12,160 | 9,523 | 10,900 | 107,029 |
| 1995 | 8,062 | 7,697 | 8,433 | 12,412 | 9,144 | 8,648 | 8,961 | 7,681 | 11,459 | 8,924 | 7,871 | 9,933 | 109,225 |
| 1996 | 7,455 | 7,389 | 9,192 | 8,631 | 9,272 | 10,885 | 6,143 | 9,463 | 8,480 | 8,537 | 8,343 | 9,897 | 103,687 |
| 1997 | 6,946 | 7,032 | 8,111 | 6,653 | 8,740 | 6,824 | 5,456 | 7,005 | 6,596 | 7,155 | 7,426 | 9,210 | 87,154 |
| 1998 | 5,971 | 5,392 | 6,033 | 5,716 | 7,883 | 5,875 | 4,449 | 5,988 | 5,725 | 7,479 | 5,170 | 6,739 | 72,420 |
| 1999 | 4,470 | 4,508 | 5,224 | 4,759 | 6,480 | 5,306 | 5,388 | 4,956 | 5,466 | 5,998 | 4,947 | 5,311 | 62,813 |
| 2000 | 4,631 | 3,494 | 3,671 | 4,495 | 3,649 | 3,913 | 3,966 | 3,522 | 4,194 | 2,960 | 3,352 | 5,287 | 47,134 |
| 2001 | 4,621 | 5,063 | 6,961 | 5,433 | 5,254 | 4,718 | 3,441 | 3,671 | 5,280 | 3,333 | 3,754 | 4,803 | 56,332 |
| 2002 | 3,736 | 3,522 | 4,764 | 3,151 | 3,808 | 3,765 | 2,831 | 3,784 | 3,070 | 2,919 | 3,922 | 3,040 | 42,312 |
| 2003 | 3,147 | 3,063 | 4,409 | 3,999 | 4,967 | 3,769 | 3,376 | 4,827 | 4,093 | 4,639 | 5,263 | 5,012 | 50,564 |
| 2004 | 4,118 | 4,220 | 4,329 | 4,340 | 6,272 | 5,213 | 5,398 | 33,890 | |||||
| TOTAL | 303,186 | 310,266 | 326,392 | 319,048 | 362,531 | 332,514 | 278,043 | 329,530 | 345,915 | 350,685 | 323,907 | 343,893 | 3,925,910 |
| 11 | 10 | 7 | 9 | 1 | 5 | 12 | 6 | 3 | 2 | 8 | 4 |