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Track Trends

Year Start End Days Races Avg. Att. Avg. Han.
1966 April 26 July 16 60 540 7,396 380,564
1967 April 25 July 15 60 540 7,168 384,166
1968 July 16 October 7 60 541 6,059 361,179
1969 April 25 July 21 60 541 6,156 377,904
1970 July 31 November 14 75 676 5,270 344,106
1971 April 15 July 27 75 679 5,166 342,010
1972 August 9 November 18 75 678 4,001 299,523
1973 April 17 July 30 75 692 4,748 387,951
1974 May 10 August 1 71 659 4,914 405,532
  August 2 November 15 75 707 4,483 388,610
1975 May 1 July 22 67 640 5,267 430,842
  July 23 November 8 83 784 4,483 407,581
1976 August 2 November 27 90 862 4,868 400,572
1977 April 9 August 8 95 908 5,293 445,050
1978 August 5 November 25 79 728 4,559 443,085
1979 April 10 July 7 65 651 4,634 475,384