This is because we changed the land ownership data category this year (as part of a fellowship with Cadasta, see here).
As you can see last year we checked the availability of following information:
Land owners name
In 2016 we assessed following data which was identified by Cadasta as crucial (see here for more information):
Parcel boundaries (inc. latitude and longitude)
Property value (i.e. Price Paid, Property Tax Value)
Tenure Type (ie. leasehold, freehold, protected lands, public lands, customary lands).
So the difference in scoring is due to our different point of assessment.
Do get in touch, if anything is unclear, I’m happy to give more background to the fellowship and the results