This varies immensely based on industry, role, experience, and even quality of application. If every one of these applications has a custom-tailored cover letter & resume, to a highly demanded position for which the applicant is well qualified for then you could see offers approach 50%. If on the other side of things the field is over saturated, the position has very few barriers to entry and therefore a high applicant pool, the applicant has very little relevant experience, and little effort was put into the resume/cover letter then you’d expect an almost 0% return.

That’s not even taking economic climate or local nuisances into consideration. I wouldn’t put much weight into the results of these without knowing the answers to a lot of the questions I posed.