| Manufacturer | 1985 | 1990 | 1995 | 1996 | 1997 | 1998 |
| Compaq | 3 | 4 | 10 | 10.1 | 13.1 | 13.8 |
| IBM | 25 | 13 | 8 | 13.1 | 8.6 | 8.2 |
| Dell | less than 1 | less than 1 | 3 | 8.6 | 5.5 | 7.9 |
| Hewlett-Packard | 2 | 1 | 4 | 4 | 5.3 | 5.8 |