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Encontré el dato exacto: 16.02
A comparación de la season 3, Grey's ha bajado el 19.2 % de rating en el mismo capítulo.

Final Ratings:

CSI - 18.071 (1.4% gain from fast nationals)
Grey's Anatomy - 16.027 (2.7% gain from fast nationals)

CSI Season 8
Episode 1: 25.22 million viewers
Episode 2: 20.97 million viewers - 16.8% drop
Episode 3: 19.794 million viewers - 5.6% drop
Episode 4: 21.22 million viewers - 6.7% gain
Episode 5: 19.06 million viewers - 10.2% drop
Episode 6: 21.943 million viewers - 13.1% gain
Episode 7: 21.37 million viewers - 2.6% loss
Episode 8: 14.749 million viewers - 31% loss
Episode 9: 18.8 million viewers - 21.5% gain
Episode 10: 19.874 million viewers - 5.4% gain
Episode 11: 18.185 million viewers - 8.5% drop
Episode 12: 20.577 million viewers - 11.6% gain
Episode 13: 20.094 million viewers - 2.3% drop
Episode 14: 17.015 million viewers - 15.3% drop
Episode 15: 18.012 million viewers - 5.5% gain
Episode 16: 18.071 million viewers - 0.3% gain

average drop: 2.75%
average viewers: 19.5

Grey's Anatomy Season 4
Episode 1: 20.93 million viewers
Episode 2: 18.51 million viewers - 11.6% drop
Episode 3: 19.036 million viewers - 2.9% gain
Episode 4: 18.04 million viewers - 5.2% drop
Episode 5: 18.175 million viewers - 0.7% gain
Episode 6: 19.31 million viewers - 5.9% gain
Episode 7: 19.501 million viewers - 0.98% gain
Epiosde 8: 19.60 million viewers - 0.5% gain
Episode 9: 14.111 million viewers - 29% drop
Episode 10: 17.78 million viewers - 20.6% gain
Episode 11: 17.679 million viewers - 0.57% drop
Episode 12: 16.37 million viewers - 7.4% drop
Episode 13: 15.31 million viewers - 6.5% drop
Episode 14: 16.027 million viewers - 4.5% gain

average drop: 1.5%
average viewers: 17.92 million viewers

CSI 8 vs. Grey's 4
Episode 1: CSI beats Grey's by 17%
Episode 2: CSI beats Grey's by 11.7%
Episode 3: CSI beats Grey's by 3.8%
Episode 4: CSI beats Grey's by 15%
Episode 5: CSI beats Grey's by 4.6%
Episode 6: CSI beats Grey's by 11.1%
Episode 7: CSI beats Grey's by 8.7%
Episode 8: Grey's beats CSI by 24.7%
Episode 9: CSI beats Grey's by 24.9%
Episode 10: CSI beats Grey's by 10.5%
Episode 11: CSI beats Grey's by 2.8%
Episode 12: CSI beats Greys by 20.4%
Episode 13: CSI beats Grey's by 23.8%
Episode 14: CSI beats Grey's by 5.8%

average win: CSI with 9.7%

Grey's 4 vs. Grey's 3
Episode 1: 20.48 - 19.4% drop
Episode 2: 18.51 - 21.2% drop
Episode 3: 19.036 - 16.5% drop
Episode 4: 18.04 - 17.7% drop
Episode 5: 18.175 - 13.3% drop
Episode 6: 19.31 - 8.2% drop
Episode 7: 19.501 - 5.6% drop
Episode 8: 19.6 - 6.3% drop
Episode 9: 14.111 - 23.8% drop
Episode 10: 17.78 - 25.9% drop
Episode 11: 17.679 - 23.2% drop
Episode 12: 16.37 - 25.4% drop
Episode 13: 15.31 - 28.8% drop
Episode 14: 16.027 - 33.7% drop

average drop: 19.2%