I had 29 eggs that I set. 7 were non fertile. No development at all. 17 have hatched out of 22 that looked good at last candling. So do you take 17 divided by 29 for hatch rate? Or do you take 17 divided by 22? Thanks PS this is just for my entertainment only. I'm tickled with my 17 as its a great number for my third time at hatching.