Nielsen isn't loving Katie Couric, whose ratings have consistently fallen in the five weeks she's been on the air as anchor of the CBS Evening News.

Last week the former Today star's broadcast averaged 7.04 million viewers, putting her in third place behind NBC's Nightly News, with 8.56 million, and ABC's World News, with 7.97 million, the Associated Press reports based on Nielsen Media Research.

Despite the erosion, Couric's network is looking on the bright side, noting that the CBS Evening News is the only one of the three network newscasts to improve its viewership for the same week compared to a year ago. Last year, NBC edged CBS by 2.2 million.