Prime-time viewership numbers compiled by Nielsen Media Research for Dec. 12-18. Listings include the week’s ranking, with viewership for the week and season-to-date rankings in parentheses. An “X” in parentheses denotes a one-time-only presentation.

1. (1) “CSI: Crime Scene Investigation,” CBS, 17.7 million viewers.

2. (8) “NCIS,” CBS, 17.1 million viewers.

3. (13) “CSI: NY,” CBS, 16.5 million viewers.

4. (3) “Without a Trace,” CBS, 15.3 million viewers.

5. (18) “Criminal Minds,” CBS, 15.2 million viewers.

6. (11) “Cold Case,” CBS, 15.2 million viewers.

7. (20) “House,” Fox, 14.6 million viewers.

8. (13) “Two And a Half Men,” CBS, 14.3 million viewers.

9. (33) “CBS Sunday Movie: The Christmas Blessing,” CBS, 13.8 million viewers.

10. (4) “CSI: Miami,” CBS, 13.8 million viewers.

11. (6) “NFL Monday Night Football: New Orleans at Atlanta,” ABC, 13.6 million viewers.

12. (12) “60 Minutes,” CBS, 12.9 million viewers.

13. (30) “The Apprentice 4,” NBC, 12.8 million viewers.

14. (28) “Numb3rs,” CBS, 12 million viewers.

15. (X) “Fox NFL Post Game,” Fox, 11.9 million viewers.

16. (36) “The Amazing Race 8,” CBS, 11.5 million viewers.

17. (30) “Close to Home,” CBS, 11.3 million viewers.

18. (18) “NFL Monday Showcase,” ABC, 11.3 million viewers.

19. (10) “Law & Order: SVU,” NBC, 11.2 million viewers.

20. (30) “Ghost Whisperer,” CBS, 10.9 million viewers.