| Passive ownership stake (update) | SC 13G/A | 2002-02-14 | - |
| Passive ownership stake | SC 13G | 2002-02-14 | - |
| Passive ownership stake (update) | SC 13G/A | 2002-02-14 | - |
| Passive ownership stake (update) | SC 13G/A | 2002-02-13 | - |
| Passive ownership stake (update) | SC 13G/A | 2002-02-08 | - |
| 10-K405 | - | 2002-01-24 | 2001-12-31 |
| Prospectus supplement | 424B2 | 2001-11-09 | - |
| Quarterly report | 10-Q | 2001-10-30 | 2001-09-30 |
| Passive ownership stake (update) | SC 13G/A | 2001-09-11 | - |
| Passive ownership stake (update) | SC 13G/A | 2001-09-10 | - |
| Prospectus supplement | 424B2 | 2001-08-01 | - |
| Prospectus supplement | 424B2 | 2001-07-23 | - |
| Quarterly report | 10-Q | 2001-07-23 | 2001-06-30 |
| Passive ownership stake | SC 13G | 2001-07-05 | - |
| Employee stock plan | S-8 | 2001-05-01 | - |
| Quarterly report | 10-Q | 2001-04-27 | 2001-03-31 |
| Major company event | 8-K | 2001-04-13 | 2001-04-12 |
| Proxy statement | DEF 14A | 2001-04-13 | 2001-05-23 |
| Passive ownership stake (update) | SC 13G/A | 2001-04-04 | - |
| 10-K405 | - | 2001-03-23 | 2000-12-31 |
| Passive ownership stake (update) | SC 13G/A | 2001-03-14 | - |
| SC TO-I/A | - | 2001-03-09 | - |
| SC TO-I/A | - | 2001-03-02 | - |
| POS AM | - | 2001-02-21 | - |
| SC TO-I/A | - | 2001-02-20 | - |
| 424B3 | - | 2001-02-20 | - |
| Passive ownership stake (update) | SC 13G/A | 2001-02-13 | - |
| Passive ownership stake | SC 13G | 2001-02-13 | - |
| Passive ownership stake | SC 13G | 2001-02-13 | - |
| Passive ownership stake (update) | SC 13G/A | 2001-02-13 | - |
| Passive ownership stake (update) | SC 13G/A | 2001-02-09 | - |
| 424B3 | - | 2001-02-02 | - |
| Major company event | 8-K | 2001-02-02 | 2001-01-30 |
| SC TO-I | - | 2001-01-31 | - |
| 424B3 | - | 2001-01-22 | - |
| Passive ownership stake | SC 13G | 2001-01-16 | - |
| 424B3 | - | 2001-01-09 | - |
| 424B3 | - | 2001-01-03 | - |
| 424B3 | - | 2000-12-19 | - |
| 424B3 | - | 2000-11-03 | - |
| Quarterly report | 10-Q | 2000-10-30 | 2000-09-30 |
| 424B3 | - | 2000-10-27 | - |
| Passive ownership stake | SC 13G | 2000-10-10 | - |
| 424B3 | - | 2000-10-03 | - |
| Annual report (amended) | 10-K/A | 2000-09-08 | 1999-12-31 |
| 424B3 | - | 2000-08-31 | - |
| 424B3 | - | 2000-08-30 | - |
| 424B3 | - | 2000-08-21 | - |
| Activist ownership stake (update) | SC 13D/A | 2000-08-16 | - |
| 424B3 | - | 2000-08-03 | - |
