| Mounth | Material & energy cost surcharge |
| June 2022 | 9,4% |
| July 2022 | 9,4% |
| August 2022 | 9,1% |
| September 2022 | 10,7% |
| October 2022 | 12,0% |
| November 2022 | 12,7% |
| December 2022 | 11,4% |
| January 2023 | 8,9% |
| February 2023 | 8,7% |
| March 2023 | 8,3% |
| April 2023 | 8.1% |
| May 2023 | 7,2% |
| June 2023 |