Well, false reports can not be considered false unless withdrew by the accuser.
Otherwise is just a shot in the dark.
It is completely valid to discredit a point with no source. And there's sources that say it is 2% false accusations (like most other crimes) and there's sources that says is 40%. Why are numbers so separate from each other? Because it's a shot in the dark.
Withdrawn != false. There are many other reasons (social pressure, for example) why someone might withdraw an accusation. Particularly when the legal system is extremely unlikely to convict.
It is completely valid to discredit a point with no source. And there's sources that say it is 2% false accusations (like most other crimes) and there's sources that says is 40%. Why are numbers so separate from each other? Because it's a shot in the dark.