I started to make a spreadsheet of the release dates. While going to previous maps for the dates, I got to the April 2014 forum and found out someone else has done the same thing. I have a much more simpler spreadsheet than the one previously posted in the forum below:
I have combined the two spreadsheets. Unfortunately, I didn't find a map for April 2011 and October 2010 dates, and I am too lazy to go through the forums and fill out the cells. From the preview image, it looks like the snapshot maybe fuzzy and hard to read so I have attached the spreadsheet as well. The cells are filled in with the info that I could find. The blank cells probably means there wasn't forum members in the state to report the date.
PE Release History.xlsx