Nielsen ratings

Prime-time viewership, in millions, compiled by Nielsen for the week ending Dec. 23.

1. "NCIS," CBS, 19.59

2. NFL Football: San Francisco at Seattle, NBC, 19.50

3. "NCIS: Los Angeles," CBS, 15.48

4. "The Voice" with Adam Levine, above, (Tuesday), NBC, 14.13

5. "Sunday Night NFL Pre-Kick," NBC, 13.67