As of this writing, just over 13,600 non-merge changesets have been pulled
into the mainline repository for the 5.2 development cycle. The time has
come, once again, for a look at where that work came from and who supported
it. There are some unique aspects to 5.2 that have thrown off some of the
usual numbers.

Source: LWN.net – [$] Statistics from the 5.2 kernel — and before