Well if I knew less than the last guy I'm defo beat here :)
Would be interesting to see what those figures were like 5 years ago (i.e. a year or so after its initial release). It seems like the concern here is that embedded Dev for cars isn't getting getting to maturity.
https://doc.redox-os.org/book/ch01-07-why-rust.html
This is probably not an up to date number but it gives you some idea of a random snapshot in time at least.