I believe if you are looking only for this index, it's better to find it directly on the BOJ website. Go BOJ > Monetary Policy > Monetary Policy Releases > Statements on Monetary Policy 2013
Or just use some popular economic calendars.
If you want to end up with a nonaverage net worth, a “learn from someone else” attitude is paramount. Putting your ego aside and admitting that you don’t know it all isn’t easy, but it is the mindset of true winner ----Paul Tudor Jones.