Instead of adding new sheets every month, and updating reports every time, I'd advice more database-like approach, with all tasks registered in single table, and getting the summary info from specific year, month, or even week using report sheets, where you select the report period, and wanted info is returned (in any format you like it) from data entry sheet.
Added is an example file for data entry (I entered data from 2 weeks from 2 different months).
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