Heater Delete?

I'd be curious to know how many of these cars were un-optioned this way.
I live in honolulu and just assumed that heater delete was fairly common for older cars, though my cars are the only examples i've seen.
Both of my cars rolled off the line as bare bones strippers with only an auto trans and, in the dart, power steering, thats it, absolutely no other options.
One wonders how many people would be willing to order and then wait for delivery of such an otherwise basic car knowing that back then, you may be waiting quite a while. Maybe the dealers just ordered most basic models that way...hmmm.
Anyone know how to dig up some numbers for these oddities?