2/3rds of the bottom 50 or so F/Os on the 747 have only 0 or 1 Xmas point and many F/Os have only 2 or 3 points all the way to the top of the list.
I'm not sure of exact numbers but the majority of these 50 joined in the last 2yrs.
My original figure was based on the fact that a colleague joined as a DEP on the 747 and was forced to work his first 2 Xmas, the next two he bid for reserve to avoid any assignment and was lucky enough to avoid any trips.