| Quarter | Avg_Price | Avg_Adv | TID |
| 1 | 387.5 | 77000 | 12020 |
| 2 | 382.9 | 84870 | 14820 |
| 3 | 378.1 | 91860 | 18140 |
| 4 | 384.1 | 78510 | 16610 |
| 5 | 378.5 | 93400 | 18400 |
| 6 | 380.6 | 90550 | 19580 |
| 7 | 378.9 | 100410 | 22270 |
| 8 | 383 | 99820 | 21740 |
| 9 | 383.2 | 83600 | 16380 |
| 10 | 379.4 | 90860 | 17390 |
| 11 | 372 | 104660 | 25800 |
| 12 | 367.2 | 108570 | 28390 |
| 13 | 378.3 | 88420 | 16430 |
| 14 | 382 | 76800 | 15960 |
| 15 | 379 | 101240 | 23060 |
| 16 | 377 | 103750 | 24410 |
| 17 | 372.7 | 98200 | 23580 |
| 18 | 368.5 | 96670 | 25050 |
| 19 | 365 | 104000 | 32850 |
| Number of firms in industry = N = 10 | |||