The number of Citizens Property Insurance Corp. policies topped 1.2 million last week but likely will decrease as customers move to private insurers. Citizens had 1,201,536 policies on Friday, up from 1,196,736 policies a week earlier and 1,191,940 two weeks earlier, according to data posted on its website. But three private insurers — Slide Insurance Co., Security First Insurance Co. and American Integrity Insurance Co. of Florida — have been approved to assume policies from Citizens this week as part of what is known as a “depopulation” program. Read: Former Boston Red Sox Pitcher Austin Mad…