US Nielsen Ratings
| Episode Number |
Year | Airdate | Rating | Share | 18-49 rating/share |
Viewers (millions) |
Rank (timeslot) |
Rank (night) |
|---|---|---|---|---|---|---|---|---|
| 1 | 2007 | April 25, 2007 | 15.4 | 24 | 10.0/26 | 26.40 | 1 | 1 |
| 2 | 2008 | April 9, 2008 | 10.3 | 16 | 6.6/18 | 17.60 | 1 | 1 |
| 3 | 2010 | April 21, 2010 | 10.4 | 18 | 5.8/17 | 18.40 | 1 | 1 |
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