
Mitsuru C. answered 01/09/20
Teaching living Japanese!
Hi Omar, I am not expart for a monetary policies by Japan Bank. But I went to through the survey monthly report page in 1978 at Japan Bank, as you mentioned there are the PDF link by a month. I found the one categories "Trends in the Balance of Payments of Developing Countries in Asia II: Focusing on the Experience After the Oil Crisis" in December as below:
I read through briefly, you might be able to find some hint of what you are looking for.
The URL is https://www.boj.or.jp/research/past_release/chosa1978.htm/. You must an advanced reader, I am so impressed! It is not easy to read through even for Japanese.
Best, Mitsu