- Site-Supervisor Survey 2023
- Site-Supervisor Survey 2022
- Site-Supervisor Survey 2021
- Site-Supervisor Survey 2020
- Site-Supervisor Survey 2019
- Site-Supervisor Survey 2018
- Site-Supervisor Survey 2017
- Site-Supervisor Survey 2016 (no data available)
- Site-Supervisor Survey 2015(no data available)
- Site-Supervisor Survey 2014
- Site-Supervisor Survey 2013 (no data available)
- Site-Supervisor Survey 2012 (no data available)
- Site-Supervisor Survey 2011
- Site-Supervisor Survey 2010