| Passive ownership stake (update) | SC 13G/A | 2001-07-09 | - |
| Quarterly report | 10-Q | 2001-04-30 | 2001-03-31 |
| Proxy statement | DEF 14A | 2001-03-21 | 2001-05-03 |
| Employee stock plan | S-8 | 2001-03-08 | - |
| Annual report | 10-K | 2001-03-07 | 2000-12-31 |
| Major company event | 8-K | 2001-02-15 | 2001-02-13 |
| Major company event | 8-K | 2000-11-15 | 2000-11-10 |
| Major company event | 8-K | 2000-10-26 | 2000-10-25 |
| Quarterly report | 10-Q | 2000-10-25 | 2000-09-30 |
| Quarterly report | 10-Q | 2000-07-26 | 2000-06-30 |
| Passive ownership stake (update) | SC 13G/A | 2000-05-17 | - |
| Quarterly report | 10-Q | 2000-05-02 | 2000-03-31 |
| Proxy statement | DEF 14A | 2000-03-20 | 2000-05-03 |
| 10-K405 | - | 2000-03-08 | 1999-12-31 |
| Passive ownership stake | SC 13G | 2000-02-14 | - |
| Passive ownership stake (update) | SC 13G/A | 2000-02-14 | - |
| Quarterly report | 10-Q | 1999-11-02 | 1999-09-30 |
| Quarterly report | 10-Q | 1999-07-27 | 1999-06-30 |
| Employee stock plan | S-8 | 1999-06-04 | - |
| Employee stock plan | S-8 | 1999-06-04 | - |
| Quarterly report | 10-Q | 1999-04-29 | 1999-03-31 |
| Proxy statement | DEF 14A | 1999-04-02 | 1999-05-04 |
| Annual report | 10-K | 1999-03-15 | 1998-12-31 |
| Passive ownership stake (update) | SC 13G/A | 1999-02-16 | - |
| Passive ownership stake (update) | SC 13G/A | 1999-02-05 | - |
| Quarterly report | 10-Q | 1998-11-06 | 1998-09-30 |
| POS AM | - | 1998-09-29 | - |
| Quarterly report | 10-Q | 1998-07-29 | 1998-06-30 |
| Quarterly report | 10-Q | 1998-05-12 | 1998-03-31 |
| Major company event | 8-K | 1998-04-23 | 1998-04-14 |
| Major company event | 8-K | 1998-04-10 | 1998-04-08 |
| 8-A12B | - | 1998-04-10 | - |
| Prospectus supplement | 424B5 | 1998-04-09 | - |
| 424B3 | - | 1998-04-06 | - |
| Major company event | 8-K | 1998-04-06 | 1998-04-06 |
| Proxy statement | DEF 14A | 1998-03-27 | 1998-05-08 |
| 10-K405 | - | 1998-03-09 | 1997-12-31 |
| S-3/A | - | 1998-02-25 | - |
| Quarterly report (amended) | 10-Q/A | 1998-02-24 | 1997-09-30 |
| Quarterly report (amended) | 10-Q/A | 1998-02-24 | 1997-06-30 |
| Quarterly report (amended) | 10-Q/A | 1998-02-24 | 1997-03-31 |
| Passive ownership stake | SC 13G | 1998-02-12 | - |
| Passive ownership stake (update) | SC 13G/A | 1998-02-04 | - |
| Securities registration | S-3 | 1998-01-20 | - |
| Quarterly report | 10-Q | 1997-10-31 | 1997-09-30 |
| Quarterly report | 10-Q | 1997-07-25 | 1997-06-30 |
| Employee stock plan | S-8 | 1997-06-13 | - |
| Passive ownership stake (update) | SC 13G/A | 1997-05-06 | - |
| Quarterly report | 10-Q | 1997-04-24 | 1997-03-31 |
| Passive ownership stake (update) | SC 13G/A | 1997-04-10 | - |
