Hello Maximus,
Four years ago I was privy to a Branch level meeting in a smaller European Country where this issue was discussed and I can confirm that the figures you note are accurate as a world average within a few percentage points.
I can also add that despite pressure being heaped on the CO's to reduce this figure, most CO's felt powerless to do anything about the situation, one uttering cynically to me after a dose or two of the 'yellow peril', 'what do they expect me to do about it, no-one listens to us anymore anyway'. An interesting aside is the average figure of young ones raised in the WTS who face the six-eyed circus ( Judicial Committee ) before the age of 21, which is, if my memory serves me well is 57%, this obviously does not include the non-reporters.
Certainly the exodus leaving the WTS the past few years has been younger ones raised within the religion. My experience is that very few younger people leave for idealogical reasons, that is the territory of the medium-long termers, but they leave simply because they are bored senseless by the endless roundabout of sterile meetings, hosted by a group of tired pastel shaded men, who if the truth were known would rather be out sailing and screaming into the wind; or because they want to live before they die. Many leave never to return after the 'reproof' or DF proclamation at the meetings, some do try to live double lives Max, but my experience is that most do not even bother to hide their intent any longer. While I think that Marvins figure of 99% leading double lives is a little wild, I would certainly put the figure at around 70%.
Please note the numbers of Judicial Committees that I was involved with during the following years :
1995: 8; 1996: 7; 1997: 12; 1998: 16; 1999: 18; 2000: 20. This is in three congregations averaging 85 publishers.
An increasing trend that seems to have been borne out by many congregations that I have discussed this situation with. About 78% of committees involved those raised in the Truth and under 21 years of age, 60% of these have left the WTS and have not returned.
As for you mentioning that your report was saving the FDS work, don't you believe it Max, they are well aware of this disaster and as ever are frenetically trying to find as many scapegoats as possible who are not GB shaped to heap the blame upon! Smarting back-sides in Paris last week.
My best to you -- HS