Let's take the numbers reported on April 6, 2013. Official membership was reported up by 341,127 to 14,782,473. The "increase in the children of record" is 122,273 and new converts are 272,330. (Mormon children are typically baptized at age 8, so a new "child of record" is a child of a member or a convert that hasn't been baptized yet.)
So are there any subtractions? The gross increase is 122,273 + 272,330 = 394,603. Difference between net and gross increase is 394,603 - 341,127 = 53,476. Even if we assume the entire subtraction is due to death, the death rate is at MOST 3.7 deaths per 1000. Compare that to the 8.4 and 8.3 deaths per 1000 for the U.S. and World respectively.
https://www.indexmundi.com/united_sta...s_profile.html
This has been going on for decades, and the LDS assumptions about its own death rates lead to a constantly increasing gap between the "real" number and the reported number even if we assumed retention rates were truly close to 100% as the church treats all former members that haven't officially resigned membership as current members.