I think it’s a lot less than that. I read somewhere around 60%
I think it's close to 70 percent. Another detail: I have also read that the statistics published by some of the racial bean-counters put into the "Hispanic" and therefore "non-white" category anyone with a Spanish surname. That drags all kinds of people into the Hispanic cohort whose families have been here since before the Civil War or the Revolution--in other words, Americans, people who speak English, and whose genetic and cultural heritage is predominantly what is called "white."
It would be great to have a source that accounts for the cultural identity of various cohorts of those referred to as Hispanic.