 Black Knight Inc. BKI, -1.48 said Monday that year-over-year home price growth in June dropped by nearly two percentage points, which the data analytics company said was the greatest single-month slowdown on record since at least the early 1970s. Black Knight said the slowdown to 17.3 annual home price growth in June from 19.3 was broad based was a record by far, and it wasnt even close, said Black Knight Data Analytics President Ben Graboske; in comparison, the strongest single-month slowing during the 2006 housing downturn was 1.19 percentage points. 