You can find enough charts to make your head spin out there.
My take on this is -
1) cumulative sales is worthless because you can always make this graph look good, because it will constantly be going up...
2) You cannot go by what Europe is doing with EVs... England, Italy, others. They are countries with cities that are thousands of years old, with very expensive gas, and many do not need long distance vehicles. They still ride bicycles and Vespas everywhere.
3) California sales - They have always been the early adopters of everything.... EVs, Liberalism, welcoming the homeless, etc. Although they are very much pro EVs, it does not represent the sentiment of the entire country. Their sales on the charts have dropped....??
I have been into new automotive tech since the 1960s and have seen many fads come and go. Overall, I think that all these charts are saying that :
1) The EV is not "taking over" as a new revolutionary OR EVEN evolutionary transportation product. In the 1990s Chevrolet started with the EV1 EV and stopped it in a blink of an eye. Today, I think that car companies have been bravely entering the EV market in an effort to test the waters of the consumer and use the EV as a tax credit write-off.
2) People, especially in the U.S., have become so fickle in their expectations that there is no room for an EV in their lifestyle. People expect nothing LESS than the large SUVs, and for the sake of convenience (and their own ego) are STILL not interested in even smaller gas cars. People are actually going in the OTHER direction... I see more giant, screaming pickup trucks flying by than ever before on CITY roads where pickups are not needed for work. Would the country accept needing to charge their car daily, plan their trips regarding the miles they drive, or not being able to fuel up in 5 minutes? I don't think so.
My take on the charts after following the journey of the EV for the last 10 years is that the EV has made become a viable vehicle for those who understand its benefits and limitations BUT... The EV will AT BEST continue to be a fringe, specialty car like 2 door convertibles, microcars like the Smart, or cars with diesel engines AND... OH YES! The GM fiasco of making a V8 diesel that would blow up, or the V8 that would turn off cylinders to make it a V6 and a V4! AT WORST - The EV will run its course as a fad, and will be allowed (by car manufacturers) to die a slow, quiet death. My additional thought that will keep the EV as a fringe specialty vehicle is that the large batteries require Lithium, which is a relatively rare element, and I understand that the earth cannot produce enough Lithium for the millions of cars needed to make the switch from gas to electric.
Proof of this is seen in the large number of manufacturers that introduce ONE EV/ Hybrid car and then drop it within 1-2 years because no one bought them.. For Example I walked into a Subaru dealer last week that had a Crosstrek EV/ Hybrid that has been on the lot for almost 1 year and they have not been able to sell if... Would you buy a Subaru EV that has only made 1000 units? Try getting parts for THAT car....