Hugo & Nebula Awards: Best Novels discussion

There are 272 authors who have been nominated for the 620 books in the H/N list. Of these, 21 authors, or 8%, account for 26% of the books. Without looking it up, guess who these authors are, and see if you can match them up to their number of nominations. It might surprise you! Some will be easy, some might not. Here's a hint:
12 books - 1 author
11 books - 2 authors
10 books - 3 authors
9 books - 1 author
8 books - 1 author
7 books - 4 authors
6 books - 9 authors

Le Guin
Bujold
Heinlein

A few obvious guesses to begin.

Looks like fun but I should sit this one out unless the others are stumped. I feel like I've looked at the author completion spreadsheet enough that I've got a lot of these answers.

Kim Stanley Robinson
Connie Willis

Stephen wrote: "Le Guin
Bujold
Heinlein

A few obvious guesses to begin."

I think Stephen is right, although I am thinking it might be Anderson or Silverberg instead of Le Guin.