| Major company event | 8-K | 2000-08-11 | 2000-08-08 |
| Quarterly report | 10-Q | 2000-07-28 | 2000-06-30 |
| Employee plan annual report | 11-K | 2000-06-29 | 1999-12-31 |
| Employee plan annual report | 11-K | 2000-06-29 | 1999-12-31 |
| Employee plan annual report | 11-K | 2000-06-29 | 1999-12-31 |
| Employee plan annual report | 11-K | 2000-06-29 | 1999-12-31 |
| Quarterly report | 10-Q | 2000-05-03 | 2000-03-31 |
| Annual report | 10-K | 2000-03-15 | 1999-12-31 |
| Proxy statement | DEF 14A | 2000-03-15 | 1999-12-31 |
| Passive ownership stake (update) | SC 13G/A | 2000-02-14 | - |
| Passive ownership stake (update) | SC 13G/A | 2000-02-02 | - |
| Passive ownership stake (update) | SC 13G/A | 2000-01-31 | - |
| 8-A12B | - | 2000-01-31 | - |
| Major company event | 8-K | 2000-01-31 | 2000-01-28 |
| Quarterly report | 10-Q | 1999-11-09 | 1999-09-30 |
| Employee stock plan | S-8 | 1999-08-09 | - |
| Quarterly report | 10-Q | 1999-08-05 | 1999-06-30 |
| 11-K/A | - | 1999-06-30 | 1998-12-31 |
| Employee plan annual report | 11-K | 1999-06-30 | 1998-12-31 |
| Employee plan annual report | 11-K | 1999-06-29 | 1998-12-31 |
| Employee plan annual report | 11-K | 1999-06-28 | 1998-12-31 |
| Employee plan annual report | 11-K | 1999-06-28 | 1998-12-31 |
| Quarterly report | 10-Q | 1999-05-05 | 1999-03-31 |
| Annual report | 10-K | 1999-03-15 | 1998-12-31 |
| Proxy statement | DEF 14A | 1999-03-12 | 1998-12-31 |
| Passive ownership stake (update) | SC 13G/A | 1999-02-16 | - |
| Passive ownership stake (update) | SC 13G/A | 1999-02-16 | - |
| Passive ownership stake | SC 13G | 1999-02-09 | - |
| Passive ownership stake (update) | SC 13G/A | 1999-01-27 | - |
| Quarterly report | 10-Q | 1998-11-13 | 1998-09-30 |
| Quarterly report | 10-Q | 1998-08-07 | 1998-06-30 |
| Employee plan annual report | 11-K | 1998-06-29 | 1997-12-31 |
| Quarterly report | 10-Q | 1998-05-05 | 1998-03-31 |
| Employee stock plan | S-8 | 1998-03-27 | - |
| Employee stock plan | S-8 | 1998-03-27 | - |
| Employee stock plan | S-8 | 1998-03-27 | - |
| Proxy statement | DEF 14A | 1998-03-13 | 1997-12-31 |
| Annual report | 10-K | 1998-03-13 | 1997-12-31 |
| Passive ownership stake (update) | SC 13G/A | 1998-02-13 | - |
| Passive ownership stake (update) | SC 13G/A | 1998-02-11 | - |
| Passive ownership stake (update) | SC 13G/A | 1998-02-10 | - |
| Passive ownership stake (update) | SC 13G/A | 1998-01-23 | - |
| Quarterly report | 10-Q | 1997-11-05 | 1997-09-30 |
| Quarterly report | 10-Q | 1997-08-08 | 1997-06-30 |
| Employee plan annual report | 11-K | 1997-06-30 | 1996-12-31 |
| Major company event (amended) | 8-K/A | 1997-06-09 | 1997-03-26 |
| Quarterly report | 10-Q | 1997-05-14 | 1997-03-31 |
| Major company event | 8-K | 1997-04-10 | 1994-04-10 |
| Proxy statement | DEF 14A | 1997-03-14 | 1996-04-24 |
| 10-K405 | - | 1997-03-13 | 1996-12-31 |
