You want to know how many elementary schools used English for all or part of their "comprehensive studies" courses in 2002? Give a look at this article from the Japan Times:
"NPO looks for English boost via teacher-accreditation plan"
The answer is 56%. The NPO plans to list teachers and institutions that train teachers for teaching English at the elementary level.
It is an interesting scheme, and private. The MOE doesn't plan on starting their own accredication system, but says that public schools can use this one.
This is what it's called in Japanese:
I'll read up on it and explain more later.