| Passive ownership stake (update) | SC 13G/A | 2001-02-12 | - |
| Passive ownership stake (update) | SC 13G/A | 2001-01-10 | - |
| Quarterly report | 10-Q | 2000-12-13 | 2000-10-29 |
| Passive ownership stake | SC 13G | 2000-12-12 | - |
| Employee stock plan | S-8 | 2000-10-27 | - |
| Quarterly report | 10-Q | 2000-09-12 | 2000-07-30 |
| Employee plan annual report | 11-K | 2000-06-27 | 1999-12-31 |
| Quarterly report | 10-Q | 2000-06-14 | 2000-04-30 |
| Proxy statement | DEF 14A | 2000-05-01 | 2000-05-31 |
| Annual report | 10-K | 2000-05-01 | 2000-01-30 |
| Passive ownership stake (update) | SC 13G/A | 2000-02-18 | - |
| Passive ownership stake (update) | SC 13G/A | 2000-02-04 | - |
| Quarterly report | 10-Q | 1999-12-13 | 1999-10-31 |
| Major company event | 8-K | 1999-10-04 | 1999-09-22 |
| Quarterly report | 10-Q | 1999-09-13 | 1999-08-01 |
| Employee stock plan | S-8 | 1999-07-02 | - |
| Employee plan annual report | 11-K | 1999-06-25 | 1998-12-31 |
| Quarterly report | 10-Q | 1999-06-15 | 1999-05-02 |
| Proxy materials | DEFA14A | 1999-05-12 | - |
| Annual report (amended) | 10-K/A | 1999-05-06 | 1999-01-31 |
| Annual report | 10-K | 1999-04-30 | 1999-01-31 |
| Proxy materials | DEFA14A | 1999-04-30 | - |
| Proxy statement | DEF 14A | 1999-04-23 | 1999-05-26 |
| PRE 14A | - | 1999-04-05 | 1999-05-26 |
| Passive ownership stake (update) | SC 13G/A | 1999-02-11 | - |
| Quarterly report | 10-Q | 1998-12-14 | 1998-11-01 |
| Passive ownership stake (update) | SC 13G/A | 1998-09-18 | - |
| Quarterly report | 10-Q | 1998-09-14 | 1998-08-02 |
| Passive ownership stake (update) | SC 13G/A | 1998-09-10 | - |
| Employee stock plan | S-8 | 1998-07-10 | - |
| 424B3 | - | 1998-07-08 | - |
| Employee plan annual report | 11-K | 1998-06-26 | 1997-12-31 |
| Quarterly report | 10-Q | 1998-06-16 | 1998-05-03 |
| Passive ownership stake (update) | SC 13G/A | 1998-06-04 | - |
| 8-A12B | - | 1998-04-30 | - |
| Annual report | 10-K | 1998-04-22 | 1998-02-01 |
| Proxy statement | DEF 14A | 1998-04-17 | 1998-05-27 |
| Employee stock plan | S-8 | 1998-03-19 | - |
| Passive ownership stake (update) | SC 13G/A | 1998-02-13 | - |
| Passive ownership stake (update) | SC 13G/A | 1998-02-12 | - |
| Passive ownership stake (update) | SC 13G/A | 1998-02-11 | - |
| Activist ownership stake | SC 13D | 1998-02-06 | - |
| Passive ownership stake (update) | SC 13G/A | 1998-01-23 | - |
| Passive ownership stake | SC 13G | 1998-01-21 | - |
| Quarterly report | 10-Q | 1997-12-17 | 1997-11-02 |
| Employee stock plan | S-8 | 1997-11-07 | - |
| Quarterly report | 10-Q | 1997-09-16 | 1997-08-03 |
| Employee plan annual report | 11-K | 1997-06-30 | 1996-12-31 |
| Quarterly report | 10-Q | 1997-06-17 | 1997-05-04 |
| 424B3 | - | 1997-06-11 | - |
