I have done a few of these in the General Discussion thread, charting the popularity/visibility/relevance (delete as appropriate since unpopular models gets lots of replies too) of certain models. I did Stephanie Fox, Lucie Wilde and Samanta Lily. The reults of which you can see below.
The stats: Replies for Stephanie Fox
March 23rd 2012 - March 22nd 2013 - 370
March 23rd 2013 - March 22nd 2014 - 174
March 23rd 2014 - March 22nd 2015 - 79
March 23rd 2015 - March 22nd 2016 - 106
March 23rd 2016 - March 22nd 2017 - 8
March 23rd 2017 - March 22nd 2018 - 8
March 23rd 2018 - March 22nd 2018 - 1
March 23rd 2019 - Present - 3
The stats: Replies for Lucie Wilde
January 31st 2014 - January 31st 2015 - 262 Replies
February 1st 2015 - January 31st 2016 - 126 Replies (retired around here)
February 1st 2016 - January 31st 2017 - 84 Replies
February 1st 2017 - January 31st 2018 - 27 Replies
February 1st 2018 - January 31st 2019 - 25 Replies
February 1st 2019 - Present - 7 Replies
The stats: Replies for Samanta Lily
January 10th 2015 - January 9th 2016 - 40 posts
January 10th 2016 - January 9th 2017 - 45 posts
January 10th 2017 - January 9th 2018 - 166 posts
January 10th 2018 - January 9th 2019 - 343 posts
January 10th 2019 - Present day - 51 posts
I have decided to (every now and then) pick another model and see how their figures compare. It will be interesting to see who are the most consistent, and see whos stars fade fast. It is also good to see how, even after retiring, some models still maintain their popularity. Watch this space...