Poverty

http://research.stlouisfed.org/fred2/series/RSAHORUSQ156S

Of course there are other variables when looking at homeownership - when the number of people in their younger twenties increases, that will push homeownership rates down looked at in the aggregate for a time even if HO ownership rates by age remained stable. But they have not remained stable. The rate of younger twenties has dropped:
https://research.stlouisfed.org/fred2/graph/?g=1lSI

As for total number of owner-occupied housing units, the total has dropped by more than 2.5 million from the peak in 2006:
http://research.stlouisfed.org/fred2/series/EOWNOCCUSQ176N

You may be technically correct, but no one looks at these statistics like this; the total number of owned housing units is irrelevant, whereas the population-adjusted number of owned housing units is relevant.

What is very, very relevant is that the situation continues to worsen year by year, and as you look at the details the damage gets worse.