| Activist ownership stake | SC 13D | 2001-09-25 | - |
| Quarterly report | 10-Q | 2001-08-13 | 2001-06-30 |
| Employee plan annual report | 11-K | 2001-06-29 | 2000-12-31 |
| Annual report | 10-K | 2001-06-26 | 2001-03-31 |
| Proxy statement | DEF 14A | 2001-06-26 | 2001-03-31 |
| Quarterly report | 10-Q | 2001-02-12 | 2000-12-30 |
| Passive ownership stake (update) | SC 13G/A | 2001-02-12 | - |
| Quarterly report | 10-Q | 2000-11-13 | 2000-09-30 |
| Quarterly report | 10-Q | 2000-08-14 | 2000-07-01 |
| Employee plan annual report | 11-K | 2000-06-29 | 1999-12-31 |
| Proxy statement | DEF 14A | 2000-06-27 | 2000-03-31 |
| Annual report | 10-K | 2000-06-23 | 2000-03-31 |
| Activist ownership stake (update) | SC 13D/A | 2000-04-20 | - |
| Quarterly report | 10-Q | 2000-02-14 | 2000-01-01 |
| Passive ownership stake | SC 13G | 2000-02-08 | - |
| Major company event | 8-K | 1999-11-22 | 1999-11-22 |
| Quarterly report | 10-Q | 1999-11-15 | 1999-10-02 |
| Activist ownership stake (update) | SC 13D/A | 1999-11-03 | - |
| Major company event (amended) | 8-K/A | 1999-08-18 | 1997-06-30 |
| Major company event (amended) | 8-K/A | 1999-08-18 | 1997-07-18 |
| Annual report (amended) | 10-K/A | 1999-08-18 | 1999-03-31 |
| S-3/A | - | 1999-08-18 | - |
| Quarterly report | 10-Q | 1999-08-17 | 1999-07-03 |
| Annual report | 10-K | 1999-06-28 | 1999-03-31 |
| Employee plan annual report | 11-K | 1999-06-28 | 1998-12-31 |
| Proxy statement | DEF 14A | 1999-06-24 | 1999-03-31 |
| S-3/A | - | 1999-06-01 | - |
| Quarterly report (amended) | 10-Q/A | 1999-06-01 | 1998-12-26 |
| Quarterly report (amended) | 10-Q/A | 1999-06-01 | 1998-09-26 |
| Quarterly report (amended) | 10-Q/A | 1999-06-01 | 1998-06-27 |
| Annual report (amended) | 10-K/A | 1999-06-01 | 1998-03-31 |
| Major company event (amended) | 8-K/A | 1999-06-01 | 1997-06-30 |
| Major company event (amended) | 8-K/A | 1999-06-01 | 1997-07-18 |
| Quarterly report (amended) | 10-Q/A | 1999-02-12 | 1998-12-26 |
| Quarterly report | 10-Q | 1999-02-09 | 1998-12-26 |
| Passive ownership stake | SC 13G | 1999-02-02 | - |
| Quarterly report | 10-Q | 1998-11-10 | 1998-09-26 |
| Securities registration | S-3 | 1998-09-30 | - |
| RW | - | 1998-09-30 | - |
| Major company event | 8-K | 1998-09-17 | 1998-09-02 |
| Activist ownership stake (update) | SC 13D/A | 1998-09-09 | - |
| 424B3 | - | 1998-08-21 | - |
| Quarterly report | 10-Q | 1998-08-12 | 1998-06-27 |
| S-1/A | - | 1998-08-07 | - |
| Proxy statement | DEF 14A | 1998-07-17 | 1998-03-31 |
| PRE 14A | - | 1998-07-15 | 1998-03-31 |
| IPO registration | S-1 | 1998-07-09 | - |
| Activist ownership stake (update) | SC 13D/A | 1998-07-02 | - |
| Major company event | 8-K | 1998-07-02 | 1998-06-22 |
| Employee plan annual report | 11-K | 1998-06-30 | 1997-12-31 |
