• Westlake average net profit margin for 2023 was 8.74%, a 48.74% decline from 2022.
• Westlake average net profit margin for 2022 was 17.05%, a 44.98% decline from 2021.
• Westlake average net profit margin for 2021 was 11.76%, a 141.48% increase from 2020.

Net profit margin can be defined as net Income as a portion of total sales revenue.