| 1997 | 2000 | Volume | Area | |||||||||
| Ageclass | Volume | %Vol. | Area | %Area | Volume | %Vol. | Area | %Area | diff. | %diff. | diff. | %diff. |
| 0-10 | 1,669,751,566 | 4.96 | 6,468,519 | 27.18 | 1,484,346,501 | 4.28 | 6,342,459 | 26.54 | -185,405,065 | -11.10 | -126,060 | -1.95 |
| 11-20 | 3,673,704,661 | 10.91 | 4,425,899 | 18.60 | 4,724,506,547 | 13.64 | 5,027,599 | 21.04 | 1,050,801,886 | 28.60 | 601,700 | 13.59 |
| 21-30 | 3,637,169,408 | 10.81 | 2,411,526 | 10.13 | 4,325,000,511 | 12.48 | 2,557,226 | 10.70 | 687,831,103 | 18.91 | 145,700 | 6.04 |
| 31-40 | 4,053,800,568 | 12.04 | 2,362,614 | 9.93 | 4,196,233,533 | 12.11 | 2,138,855 | 8.95 | 142,432,965 | 3.51 | -223,758 | -9.47 |
| 41-50 | 5,693,803,940 | 16.91 | 2,563,066 | 10.77 | 6,286,661,297 | 18.15 | 2,657,315 | 11.12 | 592,857,356 | 10.41 | 94,249 | 3.68 |
| 51-60 | 5,913,502,765 | 17.57 | 2,387,517 | 10.03 | 5,585,502,966 | 16.12 | 2,126,168 | 8.90 | -327,999,800 | -5.55 | -261,349 | -10.95 |
| 61-70 | 4,066,455,333 | 12.08 | 1,512,379 | 6.36 | 3,935,716,535 | 11.36 | 1,524,425 | 6.38 | -130,738,798 | -3.22 | 12,046 | 0.80 |
| 71-80 | 2,338,065,560 | 6.95 | 833,558 | 3.50 | 2,007,830,746 | 5.80 | 850,193 | 3.56 | -330,234,814 | -14.12 | 16,634 | 2.00 |
| 81+ | 2,615,160,993 | 7.77 | 831,046 | 3.49 | 2,100,762,054 | 6.06 | 669,406 | 2.80 | -514,398,938 | -19.67 | -161,640 | -19.45 |
| All | 33,661,414,794 | 100.00 | 23,796,124 | 100.00 | 34,646,560,690 | 100.00 | 23,893,645 | 100.00 | 985,145,896 | 2.93 | 97,522 | 0.41 |
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