There was over 400 000 citizens of Albania who used the chaos in 1999 to illegally settle in Kosovo province, faking they are regugees without documents. They are illegal aliens, and their settlement is war crime according to Geneva convention. Thier presence is easily visible in Kosovo. Their newly built houses do not have heavy fortified look of Kosovo Shqiptar compounds.
Number of Albania citizens who settled illegaly in Kosovo province in 1941-99 is in hundreds of thousands.
How many Kosovo Shqiptars settled in Albania? My guestimate is less than 20000. Do you have other info?
I hope your data is more reliable than your spelling checker (it's Kosovo, not Kosova)