^
If posters want that level of detail, they should consult IPEDS, which through a rather handy tool allows you to rank colleges by the number of graduates in a particular major (either all colleges or whichever subset you decide to rank). I have only so much time, alas. With growing numbers of interdisciplinary majors, moreover, it’s hard to draw a line – would you count biochemistry as biology or chemistry? Environmental science as biology or geology? Etc. etc.
I do think it’s very important to avoid lumping all the sciences together for PhD production, however. Upwards of 75% of biology majors can be pre-med – in math or physics, the percentage will be considerably smaller. Some science disciplines, like geology, either don’t require an advanced degree at all or require only a MS for a great job.