Sunday's Bruno Mars-loving Grammy Awards took a dramatic ratings spill, fetching the smallest demo audience in the show's history.

The telecast, which ran a bloated three-and-a-half hours, was off by 24 percent from 2017 with adjusted numbers. With time zone adjustments taken into account, the telecast averaged 19.8 million viewers and a 5.9 rating among adults 18-49. The second stat marked a low for the show. Among total viewers, that number was down even more than overnight returns from Nielsen Media that it a 12.7 rating among households. It's the biggest drop for the Grammys since the 2013, the year after the show swelled following the death of Whitney Houston.