| 2015/3 | 2016/3 | 2017/3 | 2018/8 | 2019/3 | 2020/3 | 2021/3 | 2022/3 | 2023/3 | 2024/3 | |
| Total | 8,246 | 8,103 | 7,988 | 7,817 | 7,740 | 7,830 | 7,913 | 8,068 | 8,124 | 8,218 |
| System engineers | 4,584 | 4,424 | 3,271 | 3,306 | 3,437 | 3,448 | 3,451 | 3,476 | 3,515 | 3,523 |
| System service engineers, etc. | 1,006 | 985 | 2,117 | 1,948 | 1,720 | 1,652 | 1,598 | 1,586 | 1,574 | 1,521 |
| Sales | 1,490 | 1,409 | 1,323 | 1,389 | 1,249 | 1,253 | 1,300 | 1,343 | 1,344 | 1,353 |
| Staff | 1,166 | 1,285 | 1,277 | 1,174 | 1,334 | 1,477 | 1,564 | 1,663 | 1,691 | 1,821 |