Deductions & credits

Much appreciated, thanks. Under the Prior Depreciation Column for 2020, the last of 10 years for which I took the home office deduction while I owned the home in question, there is a dollar figure. Is this the cumulative figure for the total number of years I took the home office deduction while I owned the home or is that figure for JUST the year 2020? Do I need to go back and analyze every year's return "Depreciation And Amortization Report"? Then add up all of those figures to get the total depreciation? Thanks.