Sources:
*Nielsen Cassandra Ranking Report - Nov'86 to July '99 and Wrap Sweeps+, Nov '99 to May '09. Wtd Avg DMA HH Rtg, Primary Telecasts Only.
**Nielsen/NPower/P2+ unique viewer average: 1-minute qualifier, L+7, 10/30/08-11/26/08, 3/5/09-4/1/09, 4/23/09-5/20/09.
*Nielsen Cassandra Ranking Report - Nov'86 to July '99 and Wrap Sweeps+, Nov '99 to May '09. Wtd Avg DMA HH Rtg, Primary Telecasts Only.
**Nielsen/NPower/P2+ unique viewer average: 1-minute qualifier, L+7, 10/30/08-11/26/08, 3/5/09-4/1/09, 4/23/09-5/20/09.