How much J-culture in the textbooks?

[Otaku]

64% Japanese culture in JHS English textbooks.
44% in HS English textbooks.

Just to give you a short background of the article, a researcher disected 19 JHS/HS textbooks. One of the things he researched was how much culture or cultural references are made in the textbooks.

Check it out yourself: http://www.jalt-publications.org/archive/jj/2006a/art4.pdf (pg. 65-66)