An interactive version of this chart is available here.
The definition of a working TV set changed at the end of 2015. Sets which respondents claimed had not been used to watch TV over the past six months and sets for which respondents could not specify the means of reception (cable, satellite, terrestrial, etc.) are now included in the definition. A detailed description of the change in definition can be found here.
In Q2 2017, it was estimated that there were 1.2m households without a TV set.