The legend on that chart says "U.S. electric-vehicle sales, change from a year earlier" That's a plot of the first derivative (which is still positive [+42% at

The legend on that chart says "U.S. electric-vehicle sales, change from a year earlier" That's a plot of the first derivative (which is still positive [+42% at the last measure, meaning for every 100 EVs sold in Nov 2022, there were 142 sold in Nov 2023]) and the slope of that line is a derivative of the first derivative, or a second derivative. tl;dr: EV sales are growing. That rate of growth is slower than it was before.