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Track Trends

Year Start End Days Races Avg. Att. Avg. Han.
1966 July 1 September 12 54 505 5,467 263,053
1967 June 30 September 11 54 527 5,344 251,256
1968 July 2 September 16 57 532 5,377 257,627
1969 June 27 September 8 57 545 5,928 291,209
1970 June 26 September 14 60 603 4,652 275,612
1971 May 29 June 27 11 111 6,399 333,363
July 2 September 6 49 465 5,147 299,649
1972 May 27 June 25 11 111 6,433 361,575
June 30 September 4 49 476 4,611 314,574
1973 May 19 September 3 62 597 5,235 337,675
1974 May 11 September 30 92 875 4,056 296,161
1975 May 10 September 15 84 797 4,161 297,621
1976 May 12 September 13 88 857 3,946 301,210
1977 May 11 November 20 120 1,098 3,858 308,995
1978 May 10 November 12 119 1,078 3,448 302,501
1979 May 9 November 11 119 1,075 3,114 307,696
1980 May 3 November 9 119 1,080 3,231 323,301
1981 May 2 November 8 119 1,084 3,300 343,108
1982 May 1 November 7 120 1,083 3,058 299,741
1983 May 7 November 6 117 1,047 2,815 261,751