On 12 October 2017, the Japan Patent Office (JPO) published charts and statistics as part of their status report 2017. Updated figures regarding patent and utility model application along with different stages during the prosecution of the applications (e.g. request for examination or grant) can be found in these charts. Furthermore, information about the top 10 filing companies, the top 10 universities, filing figures by country of origin etc. are available.
More information can be found on the JPO's English website.