How do you define "TV"?
If you mean a display device with a tuner built into it, then there are two in my house (old CRTs), neither connected to cable.
If you mean a display device that can be used to display content regardless of a tuner (such as via the Internet), then I have 12, not counting cell phones/iPods. (7 LCDs, three laptops, two CRTs)
If you mean a display device with a coaxial cable or antenna connection that is actively used for watching sat/cable/ota broadcasts, it would be a bit fuzzy in my case. I've got a single HTPC that is connected to an LCD monitor and also streams cable broadcasts to two XBOX 360s. So there are three display devices that can be used to view broadcast television content (theoretically four, as I have 4 tuners in the HTPC, but have not assigned the 4th to any other device).
"TV" as it existed as a physical device ten years ago, does not really match up to what is sold today. Most "TV"s sold today are really just monitors, as they often lack tuners.
I'm sure the numbers can be manipulated to show whatever the interpreter desires, just like "record" sales.