If I remember, as the rate is decreasing, the pool size will start to shrink around 2021/22 - but, I can't remember exactly where the point is.

Edit:

![image.png](https://images.hive.blog/DQmb1yC16jugrzvggUDjkaEz1QRqQLt7LqDAxfLaDdeU4EY/image.png)

This is taken from a very old Steem post and this will (i think) be affected by total supply, which fluctuates because of conversions.