Average A*/A mark?

I have been wondering what the average A*/A mark is for different subjects for an A* it would probably be below 95% because low A* marks are much more common than high A* marks and I'm assuming the same would apply to A grades with an average percentage being under 85%.Does anyone know any statistics on this?and how it varies in each subject? or should we just all post our marks and then average it out.
German(80.7%)-A
French(90.3%)-A*
Geography(87.5%)-A
RE(83%)-A
English Lit(90.8%)-A*
English Language(90.0%)-A*
Maths(98.3%)-A*
Further Maths(99.4% raw marks)-A^
Core Science(91.5%)-A*
Additional Science(92.3%)-A*
ICT(92.6% points but OCR National uses different system to GCSE)-A*A
Business(100% points but OCR National uses different system to GCSE)-A*A
PE(100% if it wasn't moderated down)-A*A*

If you are wondering why I'm doing this-its because I need it to help me choose my A-Levels because I have found a progression document and it lists the grades achieved at A-Level by students that got a certain grade at GCSE but I don't know what level of achievement an A* represents on average so I don't know how bad it is to only get a high A in Geography and I won't know my real chances of getting a certain grade at A-Level because I got a higher A than most people who achieved an A-it would also help me workout my chances for the other subjects too.