| Year | 5–49 | 50–249 | 250 and over | Total |
|---|---|---|---|---|
| Staff number between | ||||
| 2009 | 9.4 | 17.6 | 73.1 | 100.0 |
| 2010 | 8.7 | 17.4 | 73.9 | 100.0 |
| 2011 | 9.6 | 17.7 | 72.8 | 100.0 |
| 2012 | 9.7 | 18.5 | 71.8 | 100.0 |
| 2013 | 9.1 | 19.0 | 71.9 | 100.0 |
| 2014 | 8.7 | 18.5 | 72.8 | 100.0 |
| 2015 | 8.4 | 18.2 | 73.4 | 100.0 |
| 2016 | 7.8 | 19.0 | 73.2 | 100.0 |
| 2017 | 8.2 | 18.6 | 73.2 | 100.0 |
| 2018 | 8.9 | 18.5 | 72.5 | 100.0 |
| 2019 | 9.5 | 17.8 | 72.7 | 100.0 |
| 2020 | 8.5 | 17.8 | 73.8 | 100.0 |
| 2021 | 9.4 | 18.6 | 71.9 | 100.0 |
| 2022 | 9.3 | 19.0 | 71.7 | 100.0 |
| 2023 | 8.7 | 17.4 | 74.0 | 100.0 |
| 2024 | 9.0 | 17.6 | 73.4 | 100.0 |