sentences:  It adopted the program in 1913 as part of its Mutual Improvement Association program for young men, and it was the largest single sponsor of scouting until it ceased sponsoring scouting units at the end of 2019.The BSA at its peak reportedly had 4.8 million members in the 1970s with its membership plunging to less than half across its 266 local councils; down from 2.9 million in 2006 to roughly 2.3 million youth members just over a decade later.The National Council is incorporated as a 501(c)(3) non-profit organization and is funded from private donations, membership dues, corporate sponsors, and special events with total revenues of $237 million.