Revenues and expenses of teams and leagues. Originates from the now defunct Financial World magazine, continued in Forbes. In addition, there are some particular individual team data from various media sources. For example, the famous Los Angeles Times "leak" of operating profits from the Oakland Raiders trial (May 13, 2001) is included here (converted from PDF to MSExcel). The rest of the files are all in MSExcel format. So, use your "Save Target As" command to save them to your hard disk.
Annually, for each team in the league:
The Famous LA Times "Leak" (converted from PDF to MSExcel)-- Compare to the Financial World/Forbes reports
Thanks to Dan Rascher (University of San Diego), the same data for 1995-1999, but also augmented with more data there than I originally found (MSExcel): 1989-1999.
In-Depth Reports for the Green Bay Packers:
The "average team": 1968-1970, 1974
NFL Combined: 1968, 1969, 1974, 1975
NFL Teams Grouped by Revenue: 1969 (5 groupings), 1974 (3 groupings), 1975 (3 groupings)