These data covers only head phones sold separately. Most people simply use headphones (earbuds) that come with the phone. If we count those the share of BT headphones will probably be close to 0%.
I always toss out or give away the included earbuds as I can't stand them. Full around the ear muffs for me.
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So everyone that bought Bluetooth headphones did so because Apple is rumored to be removing the headphone jack on the iPhone 7? Wow!
I use my headphone nearly exclusively at work. I shuffle back and forth between three computers, so the cord was a problem. BT is so nice as I can even get up and walk to the printer while wearing my headphones, leaving the phone on my desk.