LA Times article that the Church cites on their website; cites the 6% temple divorce rate number.
William Lobdell, "Holy Matrimony," Los Angeles Times, April 8, 2000, accessed November 15, 2021
The picture isn’t rosier for other Christians or Jews. The survey showed their divorce rates about the same as the national average. There is a ray of marital hope, however. And that comes from the Church of Jesus Christ of Latter-day Saints—specifically, from those Mormons who marry in a temple. While other Mormons divorce at the usual rate, only 6% of those who undergo the demanding temple marriage break up, according to Brigham Young University professor Daniel K. Judd.