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Figure 16.18--Volume of hardwood growing stock on timberland by diameter class and year, Southern United States.

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Volume by diameter-class (in inches) and by year (billion cubic feet):

Diameter-class	1953	1963	1982	1989	1999
5.0-6.9	8.087	10.394	12.093	12.609	12.320
7.0-8.9	11.388	13.735	16.369	17.731	17.851
9.0-10.9	13.699	15.785	18.870	20.565	21.639
11.0-12.9	13.343	15.110	18.345	20.736	21.819
13.0-14.9	12.204	13.402	16.793	19.410	21.203
15.0-16.9	9.210	9.977	13.228	15.862	18.067
17.0-18.9	6.846	7.124	9.483	11.772	13.931
19.0-20.9	4.580	4.765	6.132	8.015	10.001
21.0-28.9	7.342	7.368	9.277	12.384	15.892
29+	1.309	1.325	1.824	2.520	3.363