After 103 years of "witnessing" Jehovah`s Witnesses have not come anywhere near having preached the" Good News of the kingdom in all the Inhabited Earth"
by my reckoning .
As regards population I would hazard a guess they have only preached to approximately somewhere between a quarter or maybe a third of the Inhabited earth if that.
And the way they are going now it can only get worse.
Just my 2 cents worth of observation.