31 RF lenses (29 Full Frame and 2 APS-C) plus 2 extenders have been released since 2018.
That's about 8 lens /year.
If Canon keeps the same pace in 2023, hopefully we will see more than the 6 lensens remaining in the list written by @Canon Rumors Guy
Canon TS-R 14mm f/4L
Canon TS-R 24mm...