In my area the frequency of visits are down over the last 10 years, from 3-4 visits a year to around 2. But I also used to have more pairs of Witnesses coming to the door. It used to be more common to have an older and younger witness adult team visiting. Now it is more typical that I get one person visiting or in the case of the visit two months ago, a lady and her granddaughter who was about 7 or 8 years old.
Another trend: in each of the last four visits, when I ask HOW do they know that the bible is the inspired and inerrant Written Word of God? … after they all answer that the books harmonize with each other … and I respond that that the Book of Revelation hardly harmonizes with any other book … and I then tell them that they only know that bible is the bible because Catholic Bishops said so in the 4th century … they all end the conversation and leave.
One last winter left in quite a huff saying that there is no way that the Catholic Church determined what was scripture.
At least I pointed out his error: how could an apostate Church in no later than the early 2nd century be led by the Holy Spirit to infallibly determine the canon of scripture 200+ years later?