Are there any reliable numbers on what percentage of purebred puppies are solid/adopted in the United States?

Assuming that the majority of purebred puppies in the United States are created with the intention of being sold or adopted. Where adopted includes spending the rest of their natural life in the breeders home.

Purebreds, are cultivated varieties or cultivars of an animal species, achieved through the process of selective breeding. It is reasonable to expect that each birth occurs through intentional breeding, to perpetuate the species and breed, or other specific husbandry goals.

How perfect is this current system in the United States? Are 100% of live healthy whelped puppies placed in homes?