| Year | Coal Quality | Coal Management | Coal Manager | Coal Administration |
| 2010 | 58 |
|
| 1 |
| 2011 | 85 |
|
| 2 |
| 2012 | 98 | 2 |
| 1 |
| 2013 | 115 | 1 | 3 |
|
| 2014 | 129 | 1 |
|
|
| 2015 | 118 | 2 |
| 1 |
| 2016 | 147 | 3 |
|
|
| 2017 | 155 | 4 |
|
|
| 2018 | 162 | 6 |
|
|
| 2019 | 181 | 2 |
| 1 |
| 2020 | 195 | 2 |
|
|
| 2021 | 207 | 8 | 1 |
|
| 2022 | 144 | 5 | 1 |
|
| TOTAL | 1794 | 36 | 5 | 6 |