I don't think you should get so caught up in the health of the breed as a whole. They are animals, and animals, like us, break sometimes. Of course some breeds are prone to more health issues than others, but the health of the line of dogs you are getting a dog from is more important. Remember all these stats will include poorly bred dogs, inbreeding, puppy farms, etc:
For example the 'average lifespan' of a Yorkie is 13-16 years old. My parent's Yorkie is 17 going on 18 and still chasing me down for chicken. I've seen other Yorkies act like old men at 8. Also Yorkies are a really unhealthy breed because of how popular they became. My parent's Yorkie had hip dysplasia on one side, but has never suffered from any of the other breed related issues. And her hip issues could have resulted from a senile Lurcher standing on her a couple of times when her bones were soft.
Their other Yorkie who sadly passed last yeat was 16. Never had any issues with health throughout her life except some food allergies. She was still agility capable in her jumping until the mystery illness got her. However she was the one that cost the most in vet bills - why? She ran into the road as a naughty teenager and got hit by a car.
You can't always predict life.