(the ~200 figure comes from the Inclosure acts, which, as Wikipedia says, "the majority were passed between 1750 and 1860". Even that is obviously a rough time period, and only one of many significant historical events. Even if we take Locke's birthday, 29 August 1632, as the birth of private property in the current sense, that's still roughly 380 years ago, which is still pretty new as far as human history goes.)