Track Trends
| Year |
Start |
End |
Days |
Races |
Avg. Att. |
Avg. Han. |
| 1966 | Jan 1 | Jan 15 | 13 | 130 | 10,294 | 1,135,765 |
| 1966 | Nov 19 | Dec 31 | 35 | 349 | 8,698 | 846,326 |
| 1967 | Jan 2 | Jan 16 | 13 | 130 | 10,418 | 1,141,248 |
| 1967 | Nov 18 | Dec 30 | 37 | 370 | 8,317 | 845,330 |
| 1968 | Jan 1 | Jan 16 | 14 | 140 | 10,224 | 1,201,811 |
| 1968 | Nov 16 | Dec 31 | 38 | 380 | 8,480 | 923,477 |
| 1969 | Jan 1 | Jan 16 | 14 | 140 | 10,496 | 1,273,139 |
| 1969 | Nov 15 | Dec 31 | 39 | 390 | 8,643 | 1,024,188 |
| 1970 | Jan 1 | Jan 15 | 13 | 135 | 9,305 | 1,229,402 |
| 1970 | May 6 | Oct 31 | 121 | 1067 | 3,960 | 297,058 |
| 1970 | Nov 14 | Dec 31 | 39 | 390 | 7,517 | 843,394 |
| 1971 | Jan 1 | Jan 15 | 13 | 130 | 9,096 | 1,144,437 |
| 1971 | Nov 20 | Dec 31 | 36 | 360 | 7,609 | 803,345 |
| 1972 | Jan 1 | Jan 15 | 13 | 130 | 8,949 | 1,037,206 |
