myimmitracker.com samples candidates irrespective of their PPR status, so it's a better way of measuring precipitation than Facebook and the like.
Here are the new PPRs issued this week and reported on myimmitracker:
AOR Feb 16, 2020
AOR May 13, 2020
AOR Sep 19, 2020
AOR Oct 17, 2020
AOR Oct 31, 2020
AOR Nov 1, 2020
Not looking great for late 2019 / early 2020. It could be because they are finalizing them randomly for the entire 2019 - 2020 period. Sep - Nov 2020 is overrepresented because there are more unfinalized applications in that period.
According to my back-of-the-envelope calculation, they issued PPR for about 1.2% of the applicant pool this week. If they keep the same pace, and assuming they finalize applications in any order like they did this week, applicants who got their AOR in 2020 have a 37% chance of getting their PPR by July. 97% chance by the end of this year.