This is a very interesting question and discussion. However, a variable that could greatly scew your data is how long the library has been offering ebooks. This presents two variables actually,
1. if ebooks are new to a library, then many of their card holders may not yet be aware of the ebook service. I am often first in the que for new fiction in my small regional library, but #10 on the wait list at the much larger city library even though they have more copies.
2. If ebooks have been offered at a given library for a long time, then older books may have been checked out many times in the past, and now most patrons have already read the ebook. As was pointed out, old ebooks are not weaned from the libraries offerings, so my library may now have more than 15000 ebooks. I always look only for new books offered, since I've long ago picked through the older ebook at my library. This may be true for other card holders as well, and we all rush for the new stuff.
cheers
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