There are very few breeds or strains that are genuinely high layers. These are the birds raised for the commercial egg industry, primarily. Leghorns, ISA Browns, etc. 300-330 eggs per pullet laying year. Lots of backyard flock keepers enjoy having these birds in their flocks. I know I do.
The next tier are no slouches however. Production strains of Production Reds, some strains of Rhode Island Red, of course, the various Sex Links (called by a number of names), most Australorps and even some strains of Barred Rocks and some others lay very, very well. Some of these strains can lay upwards of 290 eggs their pullet year.
Then, the field is wide open. Depending on strain, so called medium or good layers include many, many breeds. Too many to mention here, but it translates to 250 eggs per pullet year and fall off in the out years is not substantial. Steady is good description. Many times, these breeds offer other value to the owner than just egg laying.
There are also poor to good layers. Those are bred for other reasons than high egg production. These birds often are beautiful to look at and their owners keep them for their personalities or their beauty. Top level egg laying isn't essential in providing their owners great value.
Just remember that "chickens are not vending machines".
I wrote a column or two about this on my BYC page, if you'd care to read more.