| Average Diameter | 1997 | 2000 | Volume per Acre | |||||||||
| Ageclass | 1997 | 2000 | diff. | %diff. | Volume | Acres | Vol.perAcre | Volume | Acres | Vol.perAcre | diff. | %diff. |
| 0-10 | 4.486 | 2.849 | -1.637 | -36.50 | 1,669,751,566 | 6,468,519 | 258.135 | 1,484,346,501 | 6,342,459 | 234.033 | -24.102 | -9.34 |
| 11-20 | 5.766 | 4.957 | -0.809 | -14.04 | 3,673,704,661 | 4,425,899 | 830.047 | 4,724,506,547 | 5,027,599 | 939.714 | 109.667 | 13.21 |
| 21-30 | 6.840 | 5.495 | -1.345 | -19.67 | 3,637,169,408 | 2,411,526 | 1,508.244 | 4,325,000,511 | 2,557,226 | 1,691.286 | 183.042 | 12.14 |
| 31-40 | 7.251 | 5.925 | -1.326 | -18.29 | 4,053,800,568 | 2,362,614 | 1,715.812 | 4,196,233,533 | 2,138,855 | 1,961.906 | 246.094 | 14.34 |
| 41-50 | 7.777 | 6.221 | -1.556 | -20.01 | 5,693,803,940 | 2,563,066 | 2,221.482 | 6,286,661,297 | 2,657,315 | 2,365.795 | 144.313 | 6.50 |
| 51-60 | 8.335 | 6.602 | -1.733 | -20.79 | 5,913,502,765 | 2,387,517 | 2,476.842 | 5,585,502,966 | 2,126,168 | 2,627.028 | 150.186 | 6.06 |
| 61-70 | 8.622 | 6.977 | -1.645 | -19.08 | 4,066,455,333 | 1,512,379 | 2,688.781 | 3,935,716,535 | 1,524,425 | 2,581.771 | -107.009 | -3.98 |
| 71-80 | 8.889 | 6.951 | -1.937 | -21.79 | 2,338,065,560 | 833,558 | 2,804.922 | 2,007,830,746 | 850,193 | 2,361.619 | -443.303 | -15.80 |
| 81+ | 9.071 | 7.712 | -1.358 | -14.97 | 2,615,160,993 | 831,046 | 3,146.830 | 2,100,762,054 | 669,406 | 3,138.248 | -8.582 | -0.27 |
| All | 6.805 | 5.418 | -1.387 | -20.38 | 33,661,414,794 | 23,796,124 | 1,414.576 | 34,646,560,690 | 23,893,645 | 1,450.032 | 35.457 | 2.51 |
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