The table shown provides economic development data for a country from 1990-2020. 
Which decade experienced the least amount of economic development?
Definitions:
Downward-sloping Market Demand Curve
This concept depicts the inverse relationship between price and quantity demanded in a market, indicating that higher prices typically lead to lower quantities demanded, and vice versa.
Marginal Revenue
The additional income received from selling one more unit of a good or service; it's a critical concept in business and economics for understanding how to maximize profit.
Economies of Scale
Cost advantages that enterprises obtain due to their scale of operation, resulting in the cost per unit of production decreasing with increasing scale.
Average Total Cost Curve
Illustrates the average cost per unit of output, combining both fixed and variable costs, at different levels of production.
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