| Industry sector | Year (I) | Year (J) | Total drawing count | |||
| Mean diff. (I-J) | Std. error | p | ||||
| V1 | Information Transmission, Software & Information Technology Services | 2021 | 2017 | 58.076 | 15.387 | 0.001*** |
| 2021 | 2018 | 49.735 | 14.621 | 0.001*** | ||
| 2021 | 2019 | 36.617 | 14.589 | 0.012* | ||
| 2021 | 2020 | 8.570 | 14.221 | 0.547 | ||
| V3 | Production & Supply of Electricity, Heat, Gas, Water | 2021 | 2017 | 56.861 | 18.702 | 0.002** |
| 2021 | 2018 | 53.651 | 18.350 | 0.004** | ||
| 2021 | 2019 | 51.909 | 17.774 | 0.004** | ||
| 2021 | 2020 | 30.147 | 17.189 | 0.080 | ||
| V8 | Transportation, Warehousing & Postal | 2021 | 2017 | 13.653 | 6.170 | 0.027* |
| 2021 | 2018 | 16.177 | 5.567 | 0.004** | ||
| 2021 | 2019 | 6.081 | 5.472 | 0.267 | ||
| 2021 | 2020 | 9.196 | 5.178 | 0.076 | ||