Unless it falters substantially in the ratings between now and the end of the season in May, CBS's The Big Bang Theory could turn out to be the most-watched sitcom since Friends went off the air in 2004, according to the website Zap2it.com. The website noted that first-run shows of the comedy are averaging 20.3 million viewers, while, with repeats, it has been averaging 19.05 million. The final season of NBC's Friends wound with an average of about 20.8 million, Zap2it observed, while the biggest comedy since has been Everybody Loves Raymond, with 17.4 million viewers in its final season. The website noted that ratings for shows typically drop during the second half of the season, when reruns are ordinarily increased and when viewers begin making their annual Exodus after the introduction of Daylight Saving Time in March.