| Quarterly report | 10-Q | 2000-11-07 | 2000-09-30 |
| Activist ownership stake | SC 13D | 2000-10-24 | - |
| Major company event | 8-K | 2000-10-23 | 2000-09-30 |
| Quarterly report (amended) | 10-Q/A | 2000-08-18 | 2000-06-30 |
| Quarterly report | 10-Q | 2000-08-04 | 2000-06-30 |
| Employee plan annual report | 11-K | 2000-06-28 | 1999-12-31 |
| Employee plan annual report | 11-K | 2000-06-28 | 1999-12-31 |
| Employee plan annual report | 11-K | 2000-06-28 | 1999-12-31 |
| Passive ownership stake | SC 13G | 2000-05-31 | - |
| Quarterly report | 10-Q | 2000-05-10 | 2000-03-31 |
| Proxy statement | DEF 14A | 2000-03-24 | 2000-05-05 |
| Annual report | 10-K | 2000-03-13 | 1999-12-31 |
| Passive ownership stake (update) | SC 13G/A | 2000-02-18 | - |
| Passive ownership stake | SC 13G | 2000-02-14 | - |
| Passive ownership stake | SC 13G | 2000-02-11 | - |
| Passive ownership stake (update) | SC 13G/A | 2000-02-08 | - |
| Passive ownership stake (update) | SC 13G/A | 2000-02-04 | - |
| Passive ownership stake (update) | SC 13G/A | 2000-02-03 | - |
| Major company event | 8-K | 2000-01-27 | 2000-01-14 |
| Quarterly report | 10-Q | 1999-11-08 | 1999-09-30 |
| Major company event | 8-K | 1999-09-24 | 1999-09-13 |
| 424B3 | - | 1999-08-17 | - |
| 424B3 | - | 1999-08-12 | - |
| Quarterly report | 10-Q | 1999-08-05 | 1999-06-30 |
| Prospectus supplement | 424B5 | 1999-08-03 | - |
| 424B3 | - | 1999-07-06 | - |
| 424B3 | - | 1999-07-01 | - |
| 424B3 | - | 1999-07-01 | - |
| Employee plan annual report | 11-K | 1999-06-29 | 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 |
| 424B3 | - | 1999-06-22 | - |
| 424B3 | - | 1999-06-22 | - |
| 424B3 | - | 1999-06-17 | - |
| 424B3 | - | 1999-06-11 | - |
| Passive ownership stake (update) | SC 13G/A | 1999-05-07 | - |
| Quarterly report | 10-Q | 1999-05-06 | 1999-03-31 |
| Annual report | 10-K | 1999-03-26 | 1998-12-31 |
| Proxy statement | DEF 14A | 1999-03-24 | 1999-05-07 |
| Passive ownership stake (update) | SC 13G/A | 1999-02-11 | - |
| Passive ownership stake (update) | SC 13G/A | 1999-02-10 | - |
| Passive ownership stake (update) | SC 13G/A | 1999-02-05 | - |
| Passive ownership stake | SC 13G | 1999-02-03 | - |
| 424B3 | - | 1999-01-25 | - |
| 424B3 | - | 1999-01-20 | - |
| 424B3 | - | 1999-01-19 | - |
| 424B3 | - | 1999-01-14 | - |
| 424B3 | - | 1998-12-14 | - |
| 424B3 | - | 1998-12-14 | - |
