this is what i found with new ads-b stats calculation - just two samples to show the effect. these are two sites (not mine) doing well in their region since a longer time period - and both support mlat. due to new ads-b stats computing the us-site has a loss of about 30% ads-b aircrafts while the german-site loses about 60% from ads-b. this shows the effect i mentioned before …
us site 4681:
https://dl.dropboxusercontent.com/u/39745369/newadsb_4681.jpg
german site 8431:
https://dl.dropboxusercontent.com/u/39745369/newadsb_8431.jpg
p.s. 21.12.2015 wasn’t recalculated yet