Hi these links might help you.
There were a total of 203213 interests submitted on 2020, out of which 13400 were invited to apply (Ref:
https://www.canadavisa.com/canada-immigration-discussion-board/threads/pgp-2020.646383/page-176#post-9121347), i.e., remaining in the pool = 203213-13400 = 189813
In 2021, 34500 were invited to apply (Ref:
https://www.canadavisa.com/canada-immigration-discussion-board/threads/parents-and-grandparents-sponsorship-2021.744749/page-86#post-9737915), i.e., remaining in the pool = 189813 - 34500 = 155313
In 2022, IRCC announced that they will be "sending invitations to apply to 23,100 interested potential sponsors" (Ref:
https://www.canada.ca/en/immigration-refugees-citizenship/news/2022/10/reuniting-families-across-the-country.html), i.e., minimum remaining in the pool = 155313 - 23100 = 132213
This year, in 2023, "RCC will be.. sending invitations to apply to 24,200 interested potential sponsors" (Ref:
https://www.canada.ca/en/immigration-refugees-citizenship/news/notices/parents-grandparents-program-re-opens-fall.html)
Hope these numbers are what you are looking for. Best of luck to those who are waiting.