The "less than 10%" hyperbole came from Republican strategist Alex Castellanos and has been debunked by Politifact as "Mostly False". 

"Tax returns show the Clinton Foundation raised just under $143 million and spent about $85 million, including $9 million in grants to other organizations. But that does not include all of the foundation's charitable work." 

Linda Qiu, Politifact September 6, 2016