| Major company event (amended) | 8-K/A | 2001-04-13 | 2001-01-31 |
| Annual report | 10-K | 2001-04-02 | 2000-12-31 |
| Proxy statement | DEF 14A | 2001-03-29 | 2000-12-31 |
| Activist ownership stake (update) | SC 13D/A | 2001-02-15 | - |
| Passive ownership stake (update) | SC 13G/A | 2001-02-13 | - |
| 8-A12B/A | - | 2001-02-13 | - |
| Passive ownership stake (update) | SC 13G/A | 2001-02-13 | - |
| 8-A12B/A | - | 2001-02-12 | - |
| Passive ownership stake | SC 13G | 2001-02-06 | - |
| Major company event | 8-K | 2001-02-06 | 2001-01-31 |
| Major company event | 8-K | 2001-02-01 | 2000-12-31 |
| Major company event | 8-K | 2001-01-19 | 2001-01-19 |
| Passive ownership stake (update) | SC 13G/A | 2001-01-10 | - |
| DEFS14A | - | 2000-12-19 | 2001-01-19 |
| Activist ownership stake (update) | SC 13D/A | 2000-12-19 | - |
| Quarterly report | 10-Q | 2000-11-13 | 2000-09-30 |
| Major company event (amended) | 8-K/A | 2000-10-27 | 2000-09-25 |
| Major company event | 8-K | 2000-10-26 | 2000-09-30 |
| PRES14A | - | 2000-10-20 | 2000-10-31 |
| Activist ownership stake (update) | SC 13D/A | 2000-10-04 | - |
| Major company event | 8-K | 2000-09-26 | 2000-09-25 |
| Quarterly report | 10-Q | 2000-08-14 | 2000-06-30 |
| Major company event | 8-K | 2000-07-27 | 2000-06-30 |
| Employee stock plan | S-8 | 2000-07-19 | - |
| Quarterly report | 10-Q | 2000-05-15 | 2000-03-31 |
| Major company event | 8-K | 2000-04-27 | 2000-03-31 |
| Annual report | 10-K | 2000-03-29 | 1999-12-31 |
| Proxy statement | DEF 14A | 2000-03-24 | 1999-12-31 |
| Passive ownership stake (update) | SC 13G/A | 2000-02-11 | - |
| Passive ownership stake (update) | SC 13G/A | 2000-02-10 | - |
| Passive ownership stake (update) | SC 13G/A | 2000-02-04 | - |
| Major company event | 8-K | 2000-02-03 | 1999-12-31 |
| Passive ownership stake | SC 13G | 2000-01-26 | - |
| Quarterly report | 10-Q | 1999-11-15 | 1999-09-30 |
| Securities registration | S-3 | 1999-11-05 | - |
| Major company event | 8-K | 1999-10-27 | 1999-09-30 |
| Quarterly report | 10-Q | 1999-08-13 | 1999-06-30 |
| Major company event | 8-K | 1999-07-29 | 1999-06-30 |
| Quarterly report | 10-Q | 1999-05-14 | 1999-03-31 |
| 8-A12B | - | 1999-05-04 | - |
| Major company event | 8-K | 1999-05-04 | 1999-04-30 |
| Major company event | 8-K | 1999-04-29 | 1999-03-31 |
| Annual report | 10-K | 1999-03-30 | 1998-12-31 |
| Proxy statement | DEF 14A | 1999-03-26 | 1998-12-31 |
| Passive ownership stake | SC 13G | 1999-02-16 | - |
| Passive ownership stake (update) | SC 13G/A | 1999-02-12 | - |
| Passive ownership stake | SC 13G | 1999-02-11 | - |
| Passive ownership stake (update) | SC 13G/A | 1999-02-09 | - |
| Passive ownership stake (update) | SC 13G/A | 1999-02-05 | - |
| Major company event | 8-K | 1999-02-04 | 1998-12-31 |
