• Westlake average operating margin for 2023 was 11.97%, a 48.93% decline from 2022.
• Westlake average operating margin for 2022 was 23.44%, a 40.02% decline from 2021.
• Westlake average operating margin for 2021 was 16.74%, a 164.87% increase from 2020.

Operating margin can be defined as operating margin measurement of what proportion of a company's revenue is left over after paying for variable costs of production such as wages, raw materials, etc.