| passive delisting | Initiative delisting | total |
1998 | 29 | 180 | 209 |
1999 | 50 | 204 | 254 |
2000 | 61 | 225 | 286 |
2001 | 65 | 148 | 213 |
2002 | 63 | 82 | 145 |
total | 268 | 839 | 1107 |