ScenicViewer:
If more than half recanted, that's a pretty big chunk of Witneses and a victory for Hitler, while Watchtower insists that virtually all remained unbroken.
According to Kristen John-Stucke (Persecution and Resistance of Jehovah's Witnesses During the Nazi Regime, Hans Hesse 2001), about 50 percent of the BibleStudents/JWs who were sent to prison signed the letter to recant before they were released and only about 10 percent signed them once they reached the camps.
John-Stucke points out that it was not advantageous to the BS/JW prisoners to sign the letters once they reached the camps because it was, in effect, potentially signing their own death warrants because the men who signed would be sent to the front to fight and rarely returned. Not signing the recant and staying in the camps was the safest and best way for the BS/JWs to survive the war.
By the end of the war, it was not required that the BS/JWs sign a declaration - they were released on a handshake. This provision was put in place by Himmler for the many, many JW prisoners who were placed in privileged positions both within, and outside, of the camps in positions of trust for the Nazis.
Himmler's proposal to release the BS/Jws on just a handshake:
"In all these cases where prisoners are partially free and have been assigned to such work, we want to avoid written records and make such agreements with just a handshake".