The consumer stocks of cast iron in Illinois experienced a steep decline from 2015 to 2019, dropping from 3.56 to 0.003 thousand metric tons. This translates to an average annual decrease (CAGR) over this period, underscoring a significant downward trend. By 2023, the market was effectively depleted, standing at negligible levels, signifying saturation or a major shift away from cast iron consumption.

Future trends to watch:

Potential shifts towards alternative materials may further reduce demand.
Technological advancements may spark renewed interest or innovation within the industry.
Sustainability trends and regulations could influence the market dynamics.