I don't understand why there are so many downvotes on something that is, indeed, a verifiable statistical fact. Can you downvoters write a message that elaborates on why you have such a strong reaction to this data?
Apple would not exist without Steve Wozniak
Google started as a partnership
Allen sold qdos to IBM which established Microsoft
Also, Larry was always the primary driver behind Google; it started out as his thesis project, PageRank is named for him, and he'd already started crawling the web by the time Sergey joined. Sergey's initial startup idea was to order pizza via fax machine. Google obviously wouldn't exist without both of them, and Larry was smart enough to share equity and credit equally, but a startup at the YC fellowship stage is much more likely to look like Larry's thesis project than Google when it took VC.
I'm not arguing against single founders, it's perfectly possible, but most companies are not started by a single founder, they are collaborations and are all the better for it.