The chart at https://bradfordtaxinstitute.com/Free_Resources/IRS-Mileage-Rates.xml.aspx goes back to 2003. You'll have to scroll down a bit more than half way to get to the depreciation per mile chart.
For the years after 2003 up to the time you "can" know your total business miles each year, you can average each of those unknown years, based on the average of your known years.
