While I don't know what the correct number is I can almost assure you that it is nowhere near 90%. Quick and dirty if you were able to determine the amount of state business registrations and compare it to the amount of vc funded companies (even taking into account not every vc funded company is public) I'm sure you would find an extremely small number.

"personal savings and family money" - sba loan, mortgage the house, credit cards, equity line to name a few more.