What is the net profit margin ratio for each year? 
Definitions:
Average Total Cost
The total cost of production divided by the quantity produced, representing the per unit cost of goods or services.
Output
The amount of products or services generated by a company, sector, or economic system within a specific timeframe.
Marginal Cost
The expense incurred from manufacturing an extra unit of a product or service.
Average Total Cost
A rephrased definition: The per unit production cost calculated by dividing the sum of all production costs by the quantity of output produced.
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