I think they are trying to denote the trend. According to autotrader (the source of the headline claim), it was 68% two years ago and has been dropping by about 10% a year. Pretty sure the Musk factor sucked the wind out of Tesla's sales, and then there are the stories from the article where people get saddled with a massive 20K repair bill after 8 years of ownership. I'm sure that's an outlier, but you just don't get bills that high with a gas car. And as much as the government wants us all using them by 2035, they have done sweet bugger all to build up the massive charging infrastructure required to get people over their range anxiety. That doesn't instill much confidence in prospective buyers.

Not necessarily. The "don't know" chunk may be sizable.