Vehicle Depreciation - 1st time Actual Expenses

I purchased a vehicle in 2018 and placed it in service 2019. For 2019 taxes, I used mileage deduction and would like to use actual expenses for 2020 and file depreciation. Do I list my mileage deduction amount from 2019 as a previous depreciation amount or list $0 for previous depreciation claimed.  Any help is appreciated!