Averages in the Identity Stealing Business

I heard on the news tonight that an average of one in four families every year has their identity stolen.

Does that mean that in a four year run nearly everybody family has their identity stolen?

If some families get by over a four year period, then to keep the average, some families are getting their identities stolen more than once during that four year period.

And I would speculate the ones that get by are the identity stealers themselves and of course the extremely paranoid.