If you have been using Aperture, you can export the metadata as a text file then input it into excel and do whatever graphs you want:
Select your pics. File /Export Metadata. Then you have a tab-delimited txt file you can import in Excel. Then use the Dynamic table feature from Excel
Almost a decade late with this answer, but Photoshop's 'Export as…' [the replacement for 'Save for Web'] deletes almost all metadata with little option to keep it; only copyright & contact details remain, if selected.
In fact, to preserve metadata, you must use the Save for Web (Legacy) function, which still exists as of Ps 2020.
The key commands may ...