According to the report the Japanese ebook market was worth 72.9 billion yen in 2012, an increase of 16% increase over the previous year. The 2011 Japanese ebook market was worth 62.9 billion yen, or about $639 million.
The following chart comes from the report, and it details the projected growth of the Japanese ebook market over the next several years. FYI: The chart is graphed in increments of 100 million yen, so the 629 on the far left is equal to 62.9 billion yen.
The 2012 figure and related increase is particularly interesting given that for much of 2012 Amazon didn't have a local Kindle Store in Japan. The Japanese Kindle Store didn't launch until October 2012, and apparently that market was able to grow reasonably well in the absence of the menace from Seattle.
Should you be interested in buying the report, it will cost around 61 thousand yen when it is released on 18 July.