| Passive ownership stake (update) | SC 13G/A | 2002-02-22 | - |
| Passive ownership stake (update) | SC 13G/A | 2002-02-22 | - |
| Passive ownership stake (update) | SC 13G/A | 2002-02-14 | - |
| Passive ownership stake (update) | SC 13G/A | 2002-02-14 | - |
| Passive ownership stake | SC 13G | 2002-02-06 | - |
| Passive ownership stake (update) | SC 13G/A | 2002-01-10 | - |
| Passive ownership stake (update) | SC 13G/A | 2002-01-08 | - |
| Quarterly report (amended) | 10-Q/A | 2001-11-26 | 2001-09-30 |
| Activist ownership stake | SC 13D | 2001-11-19 | - |
| Major company event | 8-K | 2001-11-13 | 2001-11-07 |
| Quarterly report | 10-Q | 2001-11-13 | 2001-09-30 |
| 424B3 | - | 2001-11-09 | - |
| Activist ownership stake | SC 13D | 2001-10-26 | - |
| Major company event | 8-K | 2001-10-19 | 2001-10-17 |
| 424B3 | - | 2001-10-19 | - |
| Passive ownership stake (update) | SC 13G/A | 2001-10-10 | - |
| Quarterly report | 10-Q | 2001-08-13 | 2001-06-30 |
| Activist ownership stake (update) | SC 13D/A | 2001-06-18 | - |
| Major company event | 8-K | 2001-06-07 | 2001-06-04 |
| Prospectus supplement | 424B5 | 2001-06-06 | - |
| 424B3 | - | 2001-06-06 | - |
| Quarterly report | 10-Q | 2001-05-14 | 2001-03-31 |
| Proxy statement | DEF 14A | 2001-04-24 | 2001-05-24 |
| Annual report | 10-K | 2001-03-23 | 2000-12-31 |
| Passive ownership stake (update) | SC 13G/A | 2001-02-13 | - |
| Passive ownership stake (update) | SC 13G/A | 2001-02-13 | - |
| Passive ownership stake | SC 13G | 2001-02-09 | - |
| Activist ownership stake | SC 13D | 2001-01-23 | - |
| Major company event (amended) | 8-K/A | 2001-01-16 | 1999-09-15 |
| 424B3 | - | 2001-01-12 | - |
| Major company event | 8-K | 2001-01-12 | 2001-01-11 |
| 424B3 | - | 2000-12-15 | - |
| S-4/A | - | 2000-12-01 | - |
| Prospectus supplement | 424B5 | 2000-11-17 | - |
| Major company event | 8-K | 2000-11-16 | 2000-11-15 |
| S-4 | - | 2000-11-14 | - |
| Quarterly report | 10-Q | 2000-11-14 | 2000-09-30 |
| Securities registration | S-3 | 2000-10-20 | - |
| S-4 | - | 2000-10-19 | - |
| Major company event | 8-K | 2000-10-17 | 2000-05-24 |
| 425 | - | 2000-10-10 | - |
| 425 | - | 2000-10-05 | - |
| Securities registration | S-3 | 2000-09-08 | - |
| Activist ownership stake (update) | SC 13D/A | 2000-09-06 | - |
| Major company event | 8-K | 2000-09-06 | 1999-09-15 |
| Major company event | 8-K | 2000-08-31 | 2000-08-30 |
| Quarterly report | 10-Q | 2000-08-11 | 2000-06-30 |
| Employee stock plan | S-8 | 2000-05-25 | - |
| Quarterly report | 10-Q | 2000-05-15 | 2000-03-31 |
| Proxy statement | DEF 14A | 2000-04-20 | 2000-05-25 |
