Investors & landlords

Repeating my question for anyone who knows:

 "When I enter the depreciation for all prior years, I'm looking at the 2019 depreciation table. If the last column has an amount in there, do I add the prior years to that figure to enter it on the 2020 return or do I just enter the amount on all "prior" years listed on 2019 table without adding that last column or "current" value." "

 

I.e., I am not sure if that "current" value on the 2019's table was taken on the 2019 return so that I need to add it to the column for "prior years" to get the total I should use for TT.