<p>The population is composed by establishments with 20 or more employees, with at least 4 months of activity in 2017, and main activity code (APET) corresponding to sections B and C (division 05 to 33), to group 383 (materials recovery),<br />
excluding: subclasses: 1013B, 1071B, 1071C, 1071D (commercial crafts), 2013A and 2446Z;<br />
excluding divisions 05, 06 and 19;<br />
outside group 091.</p>
<p>The sample includes approximately 8,500 establishments.</p>