[wonderzombie]

Most likely it would've been a larger fraction at almost any point in the last 60 years.

Whether you like it or not, you derive innumerable tangible benefits from living in American society, in no small part because generations before you paid for it. You're probably white, male, hetero, relatively young, and relatively healthy, and none of the advantages which accrued to you because of that are due to your life choices. Arguably, you have the sense of entitlement exactly backwards.