'American Idol' tops Sunday's broadcast ratings but is also down week to week.

The longest-running primetime scripted series ever hit an all-time low in the ratings on Sunday.

The Simpsons recorded its smallest adults 18-49 rating ever with a 0.5. The show's 1.44 million viewers was also a low for Fox. The series wrapped up its 30th season Sunday and will be back for two more.

Following The Simpsons, the season finale of Bob's Burgers (0.6 in adults 18-49) slipped a tenth of a point vs. a week ago, while Family Guy (0.7) held steady with its finale.

ABC's American Idol led the broadcast nets in primetime with a 1.1 in the demo, off a little week to week. Its 7.1 million viewers topped all entertainment shows and finished second overall to CBS' 60 Minutes (7.44 million). America's Funniest Home Videos (1.0) and the season finale of Shark Tank (0.8) both ticked up.

Following 60 Minutes, The Red Line stayed low with a 0.3 in the demo and 3.64 million viewers. NCIS: Los Angeles, however, improved some on last week's series lows, scoring a 0.5 in adults 18-49 and a total audience of 5.75 million.

Good Girls was the only original show on NBC Sunday night, and it fell week to week to a series low 0.4 in adults 18-49. The CW's Supergirl (0.3) and Charmed (0.2) were once again steady.

Led by Idol, ABC finished on top of the network rankings with a 1.0 in adults 18-49 for the night. CBS, Fox and NBC all tied for second at 0.5. The CW posted a 0.2.

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