| Year (by completion dates) | Number of Boreholes | Cumulative Total | Deformation (m) |
| 1900s-2015 | 872 | 872 | |
| 2016 | 6 | 878 | −0.038 |
| 2017 | 9 | 887 | −0.09 |
| 2018 | 8 | 895 | −0.038 |
| 2019 | 13 | 908 | −0.067 |
| 2020 | 11 | 919 | −0.096 |
| 2021 | 9 | 928 | −0.125 |