subversion(SVN) diff in revision
 

Does anybody know how to see who added/deleted an entry in a svn file? Let's say there's a file that has A-Z in each line. Several users removed one or two letters from this file and checked it in. Now when I look at this file at one point, it has all the letters(A-Z), so whatever that was removed was added back again into the file. Now, how would I find out who removed and then added these letter after each revision. I know I can do:
svn diff -r rev#:rev# filename (where rev# is revision numbers).
This will take forever, if there's like 100 revisions.
I also tried:
svn blame -r rev# filename

This is only useful if a letter if removed. When it's added back into the file, it doesn't return anything b/c, (to me it looks like) this command only shows the user when there's difference to the entry(letter) from first version to last.

I know there's a way to do this b/c I saw this one guy do it whom i cannot get a hold of anymore.

So would like to know what's the command that shows the difference between each revision.

Thx.