| Annual report | 10-K | 2001-03-13 | 2000-12-31 |
| Proxy statement | DEF 14A | 2001-03-13 | 2001-04-24 |
| Annual report to shareholders | ARS | 2001-03-13 | 2000-12-31 |
| Passive ownership stake | SC 13G | 2001-02-14 | - |
| Major company event | 8-K | 2001-02-13 | 2001-02-12 |
| Passive ownership stake (update) | SC 13G/A | 2001-02-12 | - |
| Prospectus supplement | 424B2 | 2001-02-09 | - |
| Major company event | 8-K | 2001-02-07 | 2001-02-07 |
| Prospectus supplement | 424B5 | 2001-02-06 | - |
| Prospectus supplement | 424B5 | 2001-02-05 | - |
| Quarterly report (amended) | 10-Q/A | 2001-02-02 | 2000-09-30 |
| Quarterly report (amended) | 10-Q/A | 2001-02-02 | 2000-06-30 |
| Major company event | 8-K | 2001-01-23 | 2001-01-22 |
| Major company event | 8-K | 2001-01-18 | 2001-01-22 |
| Major company event | 8-K | 2000-12-01 | 2000-12-01 |
| S-3/A | - | 2000-11-15 | - |
| Major company event | 8-K | 2000-11-15 | 2000-11-13 |
| Quarterly report | 10-Q | 2000-10-18 | 2000-09-30 |
| Securities registration | S-3 | 2000-10-05 | - |
| Quarterly report (amended) | 10-Q/A | 2000-10-02 | 2000-06-30 |
| Quarterly report | 10-Q | 2000-07-18 | 2000-06-30 |
| Annual report (amended) | 10-K/A | 2000-06-26 | 1999-12-31 |
| Employee plan annual report | 11-K | 2000-06-26 | 1999-12-31 |
| Quarterly report | 10-Q | 2000-04-17 | 2000-03-31 |
| Annual report | 10-K | 2000-03-16 | 1999-12-31 |
| Annual report to shareholders | ARS | 2000-03-16 | 1999-12-31 |
| Proxy statement | DEF 14A | 2000-03-16 | 2000-04-25 |
| Passive ownership stake (update) | SC 13G/A | 2000-02-11 | - |
| Passive ownership stake | SC 13G | 2000-02-11 | - |
| Quarterly report | 10-Q | 1999-10-25 | 1999-09-30 |
| 11-K/A | - | 1999-08-10 | 1998-12-31 |
| Annual report (amended) | 10-K/A | 1999-08-10 | 1998-12-31 |
| Quarterly report | 10-Q | 1999-07-30 | 1999-06-30 |
| Employee plan annual report | 11-K | 1999-06-29 | 1998-12-31 |
| Annual report (amended) | 10-K/A | 1999-06-29 | 1998-12-31 |
| Quarterly report | 10-Q | 1999-04-22 | 1999-03-31 |
| Annual report | 10-K | 1999-03-30 | 1998-12-31 |
| Annual report to shareholders | ARS | 1999-03-23 | 1998-12-31 |
| Proxy statement | DEF 14A | 1999-03-17 | 1999-04-27 |
| Passive ownership stake | SC 13G | 1999-02-12 | - |
| Passive ownership stake | SC 13G | 1999-02-12 | - |
| Major company event | 8-K | 1999-01-15 | 1999-01-05 |
| Major company event | 8-K | 1998-12-08 | 1998-11-23 |
| Quarterly report (amended) | 10-Q/A | 1998-11-16 | 1998-09-30 |
| Quarterly report | 10-Q | 1998-11-12 | 1998-09-30 |
| 11-K/A | - | 1998-09-16 | 1997-12-31 |
| Annual report (amended) | 10-K/A | 1998-09-16 | 1997-12-31 |
| Quarterly report | 10-Q | 1998-07-29 | 1998-06-30 |
| Employee plan annual report | 11-K | 1998-06-26 | 1997-12-31 |
| 10-K405/A | - | 1998-06-26 | 1997-12-31 |
