| 1997 | 2000 | Volume | ||||
| Dia. Class | Volume | %Vol. | Volume | %Vol. | diff. | %diff. |
| 5-6.9 | 3,640,703,519 | 10.82 | 4,362,354,798 | 12.59 | 721,651,279 | 19.82 |
| 7-8.9 | 4,738,892,998 | 14.08 | 5,581,869,037 | 16.11 | 842,976,038 | 17.79 |
| 9-10.9 | 4,977,957,570 | 14.79 | 5,415,706,337 | 15.63 | 437,748,767 | 8.79 |
| 11-12.9 | 4,929,274,657 | 14.64 | 4,717,909,343 | 13.62 | -211,365,314 | -4.29 |
| 13-14.9 | 4,273,992,947 | 12.70 | 4,110,470,231 | 11.86 | -163,522,716 | -3.83 |
| 15-16.9 | 3,514,080,009 | 10.44 | 3,499,909,485 | 10.10 | -14,170,524 | -0.40 |
| 17-18.9 | 2,525,332,125 | 7.50 | 2,403,626,375 | 6.94 | -121,705,751 | -4.82 |
| 19-20.9 | 1,692,833,320 | 5.03 | 1,717,050,773 | 4.96 | 24,217,454 | 1.43 |
| 21-28.9 | 2,696,284,260 | 8.01 | 2,368,835,726 | 6.84 | -327,448,534 | -12.14 |
| 29-999 | 672,063,389 | 2.00 | 468,828,585 | 1.35 | -203,234,804 | -30.24 |
| All | 33,661,414,794 | 100.00 | 34,646,560,690 | 100.00 | 985,145,896 | 2.93 |
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