[KEYHAVEN]

Does any one know?

% of the European economy that is derived from “family run or private businesses”.

[Credendovidis]

Does any one know?

% of the European economy that is derived from “family run or private businesses”.

As "Europe" is quite big and diverse now-a-days, general questions like that should be passed through the EU, as the Internet at best only provides data for specific countries or group of countries.
The following is the email address for the EU Economic section, where they should be able to advice you on “family run or private businesses” in the entire EU :

European Commission - Europe Direct - M@ilbox Form

Success!
;)