Dentsu’s annual report on advertising expenditures in Japan is an estimate of advertising spending in Japan during the calendar year (January to December), representing the advertising media fees and production costs for the traditional media (newspapers, magazines, radio and television), along with those for the satellite media-related, Internet, and promotional media categories. It is prepared in cooperation with media companies and production companies. Advertising expenditures in the traditional media are also broken down into estimates for 21 industry categories. Dentsu had used the same methods and category scope in its estimate of expenditures from 1947 through 1986, but in 1987 the scope of the report was expanded beyond the four traditional media, and figures were revised retroactively to 1985. The scope of estimates was revised again in the 2007 report, with figures revised retroactively to 2005.