Answer the question using the graphical display. 
-Identify the class that has had the greatest percentage increase with respect to its initial percentage over the five decades.
Definitions:
Machining Department
A specialized division within a manufacturing operation that performs machining processes, such as cutting, shaping, or drilling materials.
Finishing Department
The last department in a manufacturing process where products are completed and made ready for sale.
Predetermined Overhead Rate
An estimated charge per unit of activity used to allocate manufacturing overhead costs to products, calculated before the accounting period begins.
Machine-Hours
Machine-hours represent a measure of production time, indicating the number of hours that machinery is in operation during a certain period.
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