Montly update of a % value [Project-Mgmt.]

Topic Labels: Base design
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4 - Data Explorer
4 - Data Explorer

Dear Airtable Community,
I need your help with the following issues. In the course of project management, the employees have to submit a monthly performance report (%) for all current projects to our controlling department.

Project XY
Performance report Nov. 2023: 75 %
Performance report Dec. 2023: 85 %

It would be great if the value of the previous months remains and is not overwritten, but I don't want to create a new column for the upcoming percentage entry every month.

I would be happy if someone could suggest a solution to this.

Best regards & thank you

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4 - Data Explorer
4 - Data Explorer

No one has any ideas / help?