Following several years of declining advertising sales, the Greenville Times reorganized its advertising sales force two years ago  Before the reorganization, the sales force was organized geographically, with some sales representatives concentrating on city-center businesses and others concentrating on different outlying regions  The reorganization attempted to increase the sales representatives' knowledge of clients' businesses by having each sales representative deal with only one type of industry or of retailing
After the reorganization, advertising sales increased
Two years ago, what proportion of the Greenville Times's total revenue was generated by advertising sales.