For public companies (corporations) in U.S. They have to do filings with the Securities and Exchange Commission (SEC) and you can find all such filings at the SEC's "Edgar" site:
https://www.sec.gov/edgar/searchedga...anysearch.html
The company name is "Tesla, Inc.".
I see 10-K filings (annual reports) going back to 2011-03-03. They went public June 29, 2010 so you're not likely to find anything other than pro-formas from before then. Often the first filing before going public contains pro-formas that approximate what is required in official reports. (They're pro-forma because they are usually assembled in the new format from whatever they were doing in their own format prior to the filing.)
There are other filings for shorter periods. You can scroll through to find the ones you want.
I didn't look, but many companies also have their filings on their own "About Us" sites or "Investor Relations" sites.
I'm curious why you want to go back 8 years.
I've seen some fairly ...ahem... "creative" pro-formas in the past so don't give a lot of credence to them however it is possible to learn from them especially if you read the footnotes and "assumptions" made. Also in addition to profit and loss you should look at balance sheets. I once saw a "creative" P&L that in tandem with its balance sheet showing the primary asset was "Goodwill" let me know it was a sham. In fact it got delisted and stopped trading 1 day after it went public which didn't surprise me given what I'd seen in its financials before listing. Not saying that is the case with Tesla but you really do need to look at everything not just the rosy "forward looking" statements of management. Many people after the Enron collapse pointed out that its footnotes when read carefully would have made reasonable investors ask "What exactly is their business?".
