via press release:
Sunday, September 19th. One of the most popular sitcoms in television history was first aired on this day 40 years ago — "The Mary Tyler Moore Show." Over seven seasons and 168 episodes, the series combined good writing and casting to examine Mary's struggle to function as a producer in what was then the man's world of television news. The cast included Valerie Harper, Cloris Leachman, Ed Asner and Ted Knight. In the final episode, everyone inexcept inept anchorman Ted Baxter is fired. Now, 38 1/2 percent of producers and directors are women, as well as 45 percent of reporters and correspondents, and over half of editors.
Sources: Chase's Calendar of Events 2010, p. 471
Statistical Abstract of the United States 2010, t. 603
SOURCE U.S. Census Bureau