Terms of Reference
2021 version (partially in effect): available here.
Key points of the 2021 version in an FAQ-style: available here.
2020 version (currently in effect): available here.
Key points of the 2020 version in an FAQ-style: available here.
2019 version: available here.
2017 version: available here.
2016 version: available here.
2015 version: available here.