Sometimes those straight lines are hard to resist. But since Devora could not resist, I'll try to.
Hens will often lay throughout their first winter without molting or stopping egg production until they molt the following fall.winter. Not all do this, but a lot do.
After their first adult molt, they continue to lay really well. Eggs are larger too.
After their second adult molt and every adult molt after that, hens will, on average, decrease laying by about 15% to 20% each molt. This is an average for a flock. You can find exceptions to this if you look at specific hens. You have to have enough hens for the average to mean much.
The other problem with coming up with hard and fast numbers is that their ancestry plays a part too. Some people specifically pick their breeding flock to select hens that lay well during their first few year while others specifically breed to have hens that lay pretty well later in life.
Not as specific an answer as I think you wanted, but maybe this will help some.