• Arcadis average operating margin for 2012 was -20.77%, a 170.19% increase from 2011.
• Arcadis average operating margin for 2011 was 29.59%, a 5.94% decline from 2010.
• Arcadis average operating margin for 2010 was 31.46%, a 450.33% decline from 2009.

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.