The rounding of the figures is not required to exemplify the status of the figures as an estimation.
Rounding is a method of simplifying information to ensure easier digestion of said information. It also works as a shortcut for those computing them. I find the fact that Ioi doesn't partake in the shortcuts as a means of care in ensuring figures are as detailed as they can be.
Besides, why approximate something that is already an estimate?
The rEVOLution is not being televised