Here are the national Nielsen top prime-time shows for April 14-20. ¿Listings include the week's ranking and viewership. Bay Area Nielsen ratings were not available.

National

1. "NCIS," CBS, 17.1 million

2. "Dancing With the Stars," ABC, 14.7

3. "NCIS: Los Angeles," CBS, 14.6

4. "The Voice," Monday, NBC, 11.8

4. "The Voice," Tuesday, NBC, 11.8

6. "The Big Bang Theory," Thursday, 8:30 p.m., CBS, 10.9

7. "Person of Interest," CBS, 10.7

8. "Scandal," ABC, 10.5

9. "The Big Bang Theory," Thursday, 8 p.m., CBS, 9.6

10. "Survivor," CBS, 9.3

11. "The Good Wife," CBS, 9.1

12. "60 Minutes," CBS, 8.8

13. "The Mentalist," CBS, 8.6

14. "Blue Bloods," CBS, 8.5

14. "American Idol," Wednesday, Fox, 8.5

16. "Grey's Anatomy," ABC, 8.4

16. "20/20," ABC, 8.4

18. "Castle," ABC, 8.1

19. "American Idol," Thursday, Fox, 7.9

20. "The Amazing Race," CBS, 7.6



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