| 10-K405 | - | 2000-03-30 | 1999-12-31 |
| Major company event | 8-K | 2000-03-07 | 2000-03-06 |
| 8-A12B | - | 2000-03-07 | - |
| Passive ownership stake | SC 13G | 2000-02-14 | - |
| Passive ownership stake | SC 13G | 2000-02-10 | - |
| Passive ownership stake (update) | SC 13G/A | 2000-02-04 | - |
| Quarterly report | 10-Q | 1999-11-12 | 1999-09-30 |
| S-8 POS | - | 1999-10-29 | - |
| Employee stock plan | S-8 | 1999-10-01 | - |
| Quarterly report | 10-Q | 1999-08-13 | 1999-06-30 |
| Employee plan annual report | 11-K | 1999-06-30 | 1998-12-31 |
| Quarterly report | 10-Q | 1999-05-17 | 1999-03-31 |
| Proxy statement | DEF 14A | 1999-03-30 | 1999-03-31 |
| Annual report | 10-K | 1999-03-30 | 1998-12-31 |
| Passive ownership stake | SC 13G | 1999-02-12 | - |
| Passive ownership stake (update) | SC 13G/A | 1999-02-12 | - |
| Passive ownership stake (update) | SC 13G/A | 1999-02-09 | - |
| Passive ownership stake (update) | SC 13G/A | 1999-02-04 | - |
| Quarterly report | 10-Q | 1998-11-16 | 1998-09-30 |
| S-8 POS | - | 1998-10-29 | - |
| S-8 POS | - | 1998-10-29 | - |
| Quarterly report | 10-Q | 1998-08-14 | 1998-06-30 |
| Employee plan annual report | 11-K | 1998-06-30 | 1997-12-31 |
| Quarterly report | 10-Q | 1998-05-15 | 1998-03-31 |
| Proxy statement | DEF 14A | 1998-03-30 | 1997-03-30 |
| Annual report | 10-K | 1998-03-30 | 1997-12-31 |
| Passive ownership stake (update) | SC 13G/A | 1998-02-12 | - |
| Passive ownership stake (update) | SC 13G/A | 1998-02-11 | - |
| Passive ownership stake | SC 13G | 1998-02-04 | - |
| Passive ownership stake | SC 13G | 1998-01-27 | - |
| Quarterly report | 10-Q | 1997-11-14 | 1997-09-30 |
| S-8 POS | - | 1997-10-30 | - |
| S-8 POS | - | 1997-10-30 | - |
| Passive ownership stake | SC 13G | 1997-09-19 | - |
| Quarterly report | 10-Q | 1997-08-14 | 1997-06-30 |
| Prospectus supplement | 424B2 | 1997-06-30 | - |
| Employee plan annual report | 11-K | 1997-06-30 | 1996-12-31 |
| Quarterly report | 10-Q | 1997-05-15 | 1997-03-31 |
| Employee stock plan | S-8 | 1997-05-09 | - |
| S-3/A | - | 1997-05-05 | - |
| Passive ownership stake (update) | SC 13G/A | 1997-05-02 | - |
| Proxy statement | DEF 14A | 1997-03-27 | 1997-03-14 |
| Annual report | 10-K | 1997-03-27 | 1996-12-31 |
| Major company event | 8-K | 1997-02-20 | 1997-02-13 |
| Passive ownership stake (update) | SC 13G/A | 1997-02-14 | - |
| Passive ownership stake (update) | SC 13G/A | 1997-02-12 | - |
| Passive ownership stake | SC 13G | 1997-02-12 | - |
| Securities registration | S-3 | 1997-01-17 | - |
| Quarterly report | 10-Q | 1996-11-14 | 1996-09-30 |
| S-8 POS | - | 1996-10-30 | - |
