How many of your embryos were genetically normal?

Curious what others have heard maybe from their clinics how many embryos should be genetically normal based on their age? We are transferring soon and and did not pg test. It was not recommended for us due to no history of loss and also my age- just turned 33. We were told egg quality looked good. We are mostly unexplained but do have lower end of sperm count but everything else good. We have 10 blasts frozen so almost all mature eggs made it to freeze. But I know that not all are genetically sound. Is it about 1/2 that should be? I know everyone is different.