So about 25% of 2.6.1 and 2.6.2, and much less in the later releases.
(A quick look shows that the first few releases have several patches with
>>>> From: NeilBrown <email@example.com>
in the comment, but:
>>>> Author: Andrew Morton <firstname.lastname@example.org>
so I figure I should be in the exclusive "41-club" too!!)