No idea--this is from an official document the PGC publishes on the 15th of each month detailing sales figures to date with a comparison to the previous year accounting for the cash received. It is a .pdf file so I can't post it but it breaks down all the various types of licenses and permits.
I'm sure the reporting rates from vendors are not 100% at this time of the year, but they probably weren't 100% in previous years either. There is no way of knowing whether or not this year's rate is different from any other year, but I will let others spin this.