Thanks.
Good points
I fully understand your concern regarding the question of who actually counts as a 'Bethelite' - that is a full-time member of the Bethel Family - with the above figures I've listed above.
The number has been listed annually in the Yearbook (in the Grand Totals page/chart) since the 2006 yearbook - the number is listed as being "a total of XX,XXX ordained ministers staff the branch facilities."
I understand that Bethel is VERY hierarchical and specific with reference to what you are - ie are you an 'actual' member of the Bethel Family. I understood from those that have worked full-time on construction projects alongside working Bethels, including international, they had to be 'careful' - although the congregation they were assigned to viewed them as Bethel Family, they were not! they were construction.
Also note the language used below
Awake 22 December 2000, page 19
Truly, it is remarkable that the number of branch offices has increased from one a hundred years ago to 109 today that serve the needs of Jehovah’s Witnesses in 234 lands. And to think that these are staffed by some 13,000 dedicated Christian volunteers! Surely, their work along with that of the some 5,500 volunteers associated with the Society’s headquarters has been vital to the fulfillment of the prophecy of Jesus Christ that ‘this good news of God’s Kingdom would be preached in all the inhabited earth before the end comes.’—Matthew 24:14.
I haven't included the 13,000 in my table (as it is not precise) but it fits for the number of Bethelites - notice WT makes a clear distinction with 'volunteers associated with the Society's headquarters' - they're not 'Family'.
The numbers (references for which I got from the two WT Index Books under the heading 'Bethel Families') are spoken of by WT in a variety of terms - but all indicate to me that they refer to full-time Bethelites. Apart from the 2007 to 2015 references (with the wording as listed above) the others I used are:
Yearbook 1991, page 9
The full-time ministers who serve at Bethel help keep the publishers in their country organized for Kingdom-preaching and well supplied with literature. In 1980 the worldwide Bethel family numbered 5,039; ten years later the figure is 11,092.
Yearbook 1987, page 11-12
the 8,920 volunteers who serve in the Bethel families
Yearbook 1985, page 58-59
the Society increased the number of Bethel family members by 9.9 percent, for a total of 7,233 worldwide.
Yearbook 1984, page 8
Working at the Society’s headquarters and other factories, offices and farms are 6,582 members of Bethel families.
Yearbook 1981, page 14
During 1980, 5,039 volunteer workers staffed the 98 branch facilities
Yearbook 1979, page 10
At the Brooklyn headquarters there are 1,825 members in the Bethel family, and, together with the 646 serving at Watchtower Farms, we now have a total of 2,471. Earth wide there are upward of 3,000 who enjoy this special privilege of Bethel service. All of them share in preaching the good news of the Kingdom in association with the congregations to which they are assigned.
Yearbook 1977, page 10
Around the world Jehovah’s Witnesses have 97 branch offices. Working in these branch offices there are upward of 3,000 members of Bethel families. The largest group is located at the international headquarters in Brooklyn, New York
Yearbook 1976, page 259
In addition, the Society has operated 96 branch offices, where 3,734 members serve.
Yearbook 1975, page 258
In addition to these expenditures, there were expenses for the upkeep of the Bethel homes, where there are 3,307 persons who work in offices, kitchens, laundries, housekeeping and in the manufacturing of literature—all to further the preaching of the good news
Yearbook 1974, page 255
In addition to these full-time workers that were assisted, we have 2,733 members of the Bethel family working in 95 branch offices.
Yearbook 1973, page 256
The Society, with the help of 2,590 members of the Bethel family in 95 branches, is well prepared to see that everyone has plenty of Bible literature.
Watchtower 1 June 1971, page 335
Additionally, 2,304 served throughout the world as full-time ministers at the Society’s 93 offices producing literature and supervising the ministry of Jehovah’s witnesses.
Yearbook 1970, page 79
Families such as this are found in the 94 branch offices around the world. The other branch offices are not nearly as large as the one in Brooklyn, but all of them are doing the same kind of work. The members of all the Bethel families throughout the world total 2,126.
Yearbook 1969, page 61
World wide there are well over 1,800 individuals
Yearbook 1968, page 286
We also have 1,717 members of the Bethel family working in the 96 branches throughout the world. This is an increase over last year's membership of 1,591.
Yearbook 1967, page 319
In addition to all these full-time workers, we have 1,591 brothers and sisters working in Bethel homes around the world in 95 branches. This is grand!
Yearbook 1965, page 531
Some 1,500 Christian ministers are privileged to serve in what are known as Bethel homes, which are attached to branch offices
Yearbook 1965, page 271
Additionally, the Society operated the Bethel homes where 1,461 full-time workers were employed.
Yearbook 1963, page 49
There are 1,423 members of the Bethel families living at the eighty-seven branch offices of the Watch Tower Society.
Yearbook 1962, page 42
In order to keep up with the world-wide demand for literature the Bethel families have grown to 1,376 members in number.
Yearbook 1961, page 30
In these main offices of supervision known as Bethel homes there are 1,299 ordained Christian ministers working.
Watchtower 1 January 1960, page 25
At the eighty-five branches throughout the world there are large and small Bethel families, and in this group there are 1,236 persons