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Data Sources
| Publisher | Source Available | Number of Articles | ||||
|---|---|---|---|---|---|---|
| From | To | Total | Before 2001 | After 2002 | ||
| Newspapers | Asahi | January 1, 1985 | December 31, 2013 | 7214291 | 3399393 | 3814898 |
| Mainichi | January 1, 1987 | December 31, 2013 | 6037737 | 2451699 | 3586038 | |
| Sankei | January 1, 1993 | December 31, 2013 | 2643272 | 947637 | 1695635 | |
| Yomiuri | January 1, 1987 | December 31, 2013 | 6326397 | 2245070 | 4081327 | |
| TV news | NHK news | January 17, 1985 | December 31, 2013 | 944395 | 385755 | 558640 |
