FUTURE DEMAND FO'R TIMBER 



395 



117). The decreases that occurred during the 

 depression years and during World War II were 

 comparatively mild. The long trend represents 

 an average rate of increase slightly under 3 per- 

 cent compounded annually, only slightly less 

 than the average annual increase in gross national 

 product during the same period. The similarity 



is, of course, not surprising. The facilities being 

 maintained in usable condition are those employed 

 in the production of the Nation's output of goods 

 and services. The expansion of productive facil- 

 ities and the expansion of output would be ex- 

 pected to progress at about the same rate. 



20 



10 





on 



eel 



C3 



NOTE: Chart is plotted on a logarithmic scale. 

 Equal vertical distances denote equal 

 percentage change. 



1915 '20 25 



SOURCE: U.S. Department of Commerce 



'30 



'35 

 YEARS 



'40 



'45 



'50 



1955 



Figure 117 



