I guess the answer to my question was: No, you don't have any statistics. (And please note, that I was not suggesting that there are no NYT mail subscribers. I just think the number is relatively low these days. Say 10,000 maybe?)
ML/NJ
Doesn't matter how low it is ~ the NYTimes uses Periodicals Class and there's a substantial cross subsidization benefit in that class AND it's always been there.
You can look at their annual circulation report (required by law) to find out how many copies they sent ~ if not the cost.