| Employee plan annual report | 11-K | 1998-06-29 | 1997-12-31 |
| Quarterly report | 10-Q | 1998-05-18 | 1998-04-04 |
| Passive ownership stake (update) | SC 13G/A | 1998-05-08 | - |
| Passive ownership stake (update) | SC 13G/A | 1998-05-07 | - |
| Passive ownership stake | SC 13G | 1998-04-07 | - |
| Annual report | 10-K | 1998-03-26 | 1998-01-03 |
| Proxy statement | DEF 14A | 1998-03-24 | 1998-05-01 |
| Passive ownership stake (update) | SC 13G/A | 1998-02-13 | - |
| Passive ownership stake (update) | SC 13G/A | 1998-02-12 | - |
| Passive ownership stake (update) | SC 13G/A | 1998-02-11 | - |
| Passive ownership stake (update) | SC 13G/A | 1998-02-10 | - |
| Passive ownership stake | SC 13G | 1998-02-10 | - |
| Passive ownership stake (update) | SC 13G/A | 1998-02-04 | - |
| Quarterly report | 10-Q | 1997-11-12 | 1997-09-27 |
| Quarterly report | 10-Q | 1997-08-08 | 1997-06-28 |
| Employee plan annual report | 11-K | 1997-06-27 | 1996-12-31 |
| Quarterly report | 10-Q | 1997-05-14 | 1997-03-28 |
| Proxy statement | DEF 14A | 1997-05-12 | 1997-06-10 |
| PRER14A | - | 1997-05-02 | - |
| Annual report | 10-K | 1997-03-20 | 1996-12-28 |
| Proxy statement | DEF 14A | 1997-03-19 | 1997-04-25 |
| PRE 14A | - | 1997-03-10 | 1997-04-25 |
| Passive ownership stake (update) | SC 13G/A | 1997-02-21 | - |
| Passive ownership stake | SC 13G | 1997-02-18 | - |
| Passive ownership stake (update) | SC 13G/A | 1997-02-13 | - |
| Passive ownership stake | SC 13G | 1997-02-12 | - |
| Passive ownership stake | SC 13G | 1997-02-12 | - |
| Passive ownership stake | SC 13G | 1997-02-10 | - |
| Quarterly report | 10-Q | 1996-11-12 | 1996-09-28 |
| Quarterly report | 10-Q | 1996-08-15 | 1996-06-29 |
| Quarterly report (amended) | 10-Q/A | 1996-06-27 | 1996-03-31 |
| Quarterly report | 10-Q | 1996-05-13 | 1996-03-30 |
| Passive ownership stake (update) | SC 13G/A | 1996-02-13 | - |
