You don’t need a time machine, just Google.
Tesla’s about 20 years old. At around the same stage in its development (Amazon was founded in 1994, so around 2014), Amazon derived about 7% of its annual revenue from book sales:
$5.25 billion : Amazon’s current annual revenue from book sales, according to one of Packer’s sources. That means books account for 7% of the company’s $75 billion in total yearly revenue.
By that time, Amazon Web Services had grown to almost the same size as the book business - just under $5 billion in revenue: