It was reported here on this forum that in the Seattle area a high level elder or CO told the one posting it that in the circuits of that area their loosing half a dozen members per circuit every six months. They also had an international assembly in Seattle last year and reported something like 70K in attendance the first day but by the pics it didn't look like it to me.
That was the OVERALL attendance of people in Seattle, PLUS the tie in cities. I was there. The thread on it is here.