To put that into perspective those numbers, just for the one region, are an average of 6.36 million and a high of 7.35 million. Numbers for the other regions haven't been widely reported, but similar viewing rates would be expected in Kansai as well, the second biggest market for being in Japan.
These numbers aren't quite as impressive as Murata's second bout with Hassan N'Dam, which peaked at 20.5%, but they have been reported as "good figures" with it being the highest sports rating of the year for Fuji TV.
Despite losing Daigo Higa (15-1, 15) [比嘉 大吾] to Cristofer Rosales (27-3, 18), and being stripped of the WBC Flyweight title before the bout, Higa was also a ratings hit. His bout averaged 10.5% of the Kanto region and peaked at 12.7%. To put those in to raw numbers that's an average of 4.54 million and a peak of of 5.49 million.
(Image courtesy of boxingnews.jp)