As Aude Sapere says the attendance relates to the downsized congregations consolidated into fewer Kingdom Hells.
The stream increasing from a trickle refers to new people posting on this site, which is not necessarily a decline in JW numbers. Even if they were still leaving at the same rate as before; there are fewer baptized and even much fewer still joining from the outside to replace those departing.
I wonder however that in among the increase here, there might be one or two posting to test the resilience and effectiveness of this site. JWHQ would be interested in what we say to counter their propaganda so as to configure a response.
I'm thinking of posters like InsidetheKH for example.