Published monthly by the NHK. Updated to the month of March 2017 (published on March 15th, 2017).
Note:"Cabinet approval/disapproval rating" is published as a part of the Monthly Survey on Japanese Political Awareness, conducted every month by The NHK Broadcasting Culture Research Institute, a research institute affiliated with NHK, Japan's public broadcaster. The original publication series are available only in Japanese. Below is a link to their web site (available only in Japanese). http://www.nhk.or.jp/bunken/yoron/political/index.html