The regional matchups for D4 back to 2009, when they started using numbers for regions.
2024 - 13-16, 14-15
2023 - 13-16, 14-15
2022 - 13-15, 14-16
2021 - 13-16, 14-15
2020 - 13-14, 15-16
2019 - 13-14, 15-16
2018 - 13-15, 14-16
2017 - 13-14, 15-16
2016 - 13-15, 14-16
2015 - 13-16, 14-15
2014 -...