| Annual report (amended) | 10-K/A | 2001-07-06 | 2000-12-31 |
| 424B3 | - | 2001-06-15 | - |
| 424B3 | - | 2001-06-15 | - |
| 424B3 | - | 2001-06-15 | - |
| S-3/A | - | 2001-06-11 | - |
| Quarterly report | 10-Q | 2001-05-15 | 2001-03-31 |
| Major company event | 8-K | 2001-04-10 | 2001-04-10 |
| Proxy statement | DEF 14A | 2001-04-09 | 2001-05-16 |
| Securities registration | S-3 | 2001-03-30 | - |
| Major company event | 8-K | 2001-03-16 | 2001-03-16 |
| Annual report | 10-K | 2001-03-09 | 2000-12-31 |
| Major company event (amended) | 8-K/A | 2001-03-08 | 2000-12-29 |
| 424B3 | - | 2001-02-23 | - |
| Passive ownership stake (update) | SC 13G/A | 2001-02-14 | - |
| Passive ownership stake (update) | SC 13G/A | 2001-02-09 | - |
| Major company event | 8-K | 2001-01-12 | 2000-12-29 |
| 424B3 | - | 2000-11-20 | - |
| Quarterly report | 10-Q | 2000-11-14 | 2000-09-30 |
| S-3/A | - | 2000-09-07 | - |
| Quarterly report | 10-Q | 2000-08-14 | 2000-06-30 |
| Securities registration | S-3 | 2000-06-08 | - |
| Quarterly report | 10-Q | 2000-05-15 | 2000-03-31 |
| 424B3 | - | 2000-04-20 | - |
| Proxy statement | DEF 14A | 2000-04-10 | 2000-05-17 |
| 424B3 | - | 2000-03-24 | - |
| Annual report | 10-K | 2000-03-15 | 1999-12-31 |
| Passive ownership stake (update) | SC 13G/A | 2000-02-10 | - |
| Passive ownership stake (update) | SC 13G/A | 2000-02-10 | - |
| Passive ownership stake (update) | SC 13G/A | 2000-01-19 | - |
| Passive ownership stake (update) | SC 13G/A | 2000-01-04 | - |
| 424B3 | - | 1999-12-02 | - |
| Quarterly report | 10-Q | 1999-11-05 | 1999-09-30 |
| 424B3 | - | 1999-08-04 | - |
| Quarterly report | 10-Q | 1999-08-03 | 1999-06-30 |
| Quarterly report | 10-Q | 1999-05-06 | 1999-03-31 |
| Proxy statement | DEF 14A | 1999-04-06 | 1999-05-12 |
| Annual report | 10-K | 1999-03-17 | 1998-12-31 |
| 424B3 | - | 1999-02-19 | - |
| S-3/A | - | 1999-02-17 | - |
| Passive ownership stake (update) | SC 13G/A | 1999-02-09 | - |
| Passive ownership stake (update) | SC 13G/A | 1999-02-01 | - |
| Major company event (amended) | 8-K/A | 1999-01-11 | 1998-11-06 |
| Quarterly report | 10-Q | 1998-11-13 | 1998-09-30 |
| Major company event | 8-K | 1998-11-12 | 1998-11-06 |
| Quarterly report (amended) | 10-Q/A | 1998-11-12 | 1998-06-30 |
| Passive ownership stake (update) | SC 13G/A | 1998-10-13 | - |
| Securities registration | S-3 | 1998-09-30 | - |
| 424B3 | - | 1998-08-27 | - |
| Quarterly report | 10-Q | 1998-08-14 | 1998-06-30 |
| 424B3 | - | 1998-08-13 | - |
