I dont mind providing back-up at all. This is the internet; nothing should be taken at face value.
Television ratings are fun things. The "lowest rating ever" was a comment from a friend at NBC. Their 1.1 for a Stanley Cup was the lowest recorded rating for a program ever for NBC - sports, entertainment, whatever.
http://sports.espn.go.com/nhl/playoffs2007/news/story?id=2894490
(The episode of 'West Wing' mentioned in the article actually scored a couple hundredths of a point higher, but ratings are traditionally rounded to a single decimal point.)
The article that buckylarue posted has a good explanation of the differences between rating points and share.
Rating information is controlled by the Nielson company and a subscription to a ratings book is a very expensive. Theyve also been very aggressive about wiping the internet of numbers. The only good historical information Ive been able to find on the pipes of the Internets is the share.
I took a quick look at fifty years ago 1957. The U.S. population in 1957 was 172 million people. Today, its some 300 million people virtually doubled. The one estimate I found said that 1957 some 90% of all American households owned television sets (that was up from just 10% in 1953). The article is at
http://www.loti.com/fifties_TV/you_are_there_history_comes_to_television.htm
According to the website (
http://www.trivia-library.com/c/top-television-show-ratings-1957.htm), the top show in 1957 was Gunsmoke with a 43.1 share. That means 43.1% of all households with televisions watched the show. The top rated show in 2007 was American Idol with a share of 27. The highest rated series was CSI with a share of 17. Whats interesting was that in 1957, a share of 27 wouldnt even have landed you in the top ten.
Ill continue to see if I can publish the actual number of viewers. If nothing else, these numbers show how fractured the television landscape has become. Networks used to be able to get well over a third of the country to watch them, now it takes a true miracle show like Idol to not-even-come-close to that result.
FYI: The Top Ten for 1957 and their shares:
1. Gunsmoke CBS 43.1
2. The Danny Thomas Show CBS 35.3
3. Tales of Wells Fargo NBC 35.2
4. Have Gun Will Travel CBS 33.7
5. I've Got a Secret CBS 33.4
6. The Life and Legend of Wyatt Earp ABC 32.6
7. General Electric Theater CBS 31.5
8. The Restless Gun NBC 31.4
9. December Bride CBS 30.7
10. You Bet Your Life NBC 30.6
And for interest in 1955:
1. The $64,000 Question CBS 47.5
2. I Love Lucy CBS 46.1
3. The Ed Sullivan Show CBS 39.5
4. Disneyland ABC 37.4
5. The Jack Benny Show CBS 37.2
6. December Bride CBS 37.0
7. You Bet Your Life NBC 35.4
8. Dragnet NBC 35.0
9. The Millionaire CBS 33.8
10. I've Got a Secret CBS 33.5
For 2007, the top rated ABC show was Dancing with the Stars with a 12.7 rating and a 20 share; the top ABC series was Greys Anatomy with a 10.3/16.