Each time an asset is purchased, all information goes on the 4562, stating the purchase price, date placed in service, and method of depreciation. Then totals are carried over for following years. Since you have 2015-2019, you can determine the depreciation for those years by looking at 4562.
For 2020, you still have your required personal records so you can determine the depreciation and business use percentage. Your 2015 gives you the starting point.
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