| POS AM | - | 1999-11-19 | - |
| Passive ownership stake | SC 13G | 1999-11-12 | - |
| Quarterly report | 10-Q | 1999-09-16 | 1999-08-31 |
| Passive ownership stake | SC 13G | 1999-09-10 | - |
| Passive ownership stake | SC 13G | 1999-09-09 | - |
| Annual report | 10-K | 1999-08-27 | 1999-05-31 |
| Proxy statement | DEF 14A | 1999-08-13 | 1999-10-07 |
| PRE 14A | - | 1999-07-30 | 1999-10-07 |
| Employee stock plan | S-8 | 1999-07-30 | - |
| Major company event | 8-K | 1999-06-29 | 1999-05-31 |
| Employee plan annual report | 11-K | 1999-06-25 | 1998-12-31 |
| Quarterly report | 10-Q | 1999-03-17 | 1999-02-28 |
| Passive ownership stake (update) | SC 13G/A | 1999-02-09 | - |
| Passive ownership stake (update) | SC 13G/A | 1999-02-03 | - |
| Quarterly report | 10-Q | 1998-12-15 | 1998-11-30 |
| Quarterly report | 10-Q | 1998-10-15 | 1998-08-31 |
| Major company event | 8-K | 1998-10-02 | 1998-10-01 |
| Employee stock plan | S-8 | 1998-10-01 | - |
| Major company event | 8-K | 1998-09-15 | 1998-08-31 |
| Annual report | 10-K | 1998-08-27 | 1998-05-31 |
| Proxy statement | DEF 14A | 1998-08-07 | 1998-08-07 |
| Major company event | 8-K | 1998-07-02 | 1998-05-31 |
| Employee plan annual report | 11-K | 1998-06-29 | 1997-12-31 |
| Quarterly report | 10-Q | 1998-04-07 | 1998-02-28 |
| Passive ownership stake (update) | SC 13G/A | 1998-01-26 | - |
| Passive ownership stake (update) | SC 13G/A | 1998-01-15 | - |
| Quarterly report | 10-Q | 1998-01-14 | 1997-11-30 |
| Quarterly report | 10-Q | 1997-10-14 | 1997-08-31 |
| Passive ownership stake (update) | SC 13G/A | 1997-09-18 | - |
| Annual report | 10-K | 1997-08-15 | 1997-05-31 |
| Proxy statement | DEF 14A | 1997-08-07 | 1997-08-08 |
| PRE 14A | - | 1997-07-22 | 1997-08-08 |
| Employee plan annual report | 11-K | 1997-06-26 | 1996-12-31 |
| POS AM | - | 1997-05-22 | - |
| S-3/A | - | 1997-05-22 | - |
| Passive ownership stake (update) | SC 13G/A | 1997-05-12 | - |
| Major company event | 8-K | 1997-04-25 | 1997-04-22 |
| S-3/A | - | 1997-03-27 | - |
| Quarterly report | 10-Q | 1997-03-26 | 1997-02-28 |
| Passive ownership stake (update) | SC 13G/A | 1997-02-21 | - |
| Passive ownership stake (update) | SC 13G/A | 1997-02-18 | - |
| Passive ownership stake (update) | SC 13G/A | 1997-02-13 | - |
| Passive ownership stake | SC 13G | 1997-02-12 | - |
| Securities registration | S-3 | 1997-01-31 | - |
| Passive ownership stake (update) | SC 13G/A | 1997-01-30 | - |
| Major company event | 8-K | 1997-01-21 | 1996-12-31 |
| Quarterly report | 10-Q | 1997-01-14 | 1996-11-30 |
| Securities registration | S-3 | 1996-10-30 | - |
| Quarterly report (amended) | 10-Q/A | 1996-10-30 | 1996-08-31 |
| Major company event | 8-K | 1996-10-22 | 1996-09-30 |
