You can see that on a class-by-class basis by digging into funding data per class here: https://seed-db.com/accelerators/view?acceleratorid=1011 (click on the "+" to expand each class)

In the most successful class (AirBnB in W09), the majority of companies went to $0. In the most successful recent class (W14), the median startup raised a seed round but nothing else in four years.