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Track Trends

Year Start End Days Races Avg. Att. Avg. Han.
1966 October 3 October 22 18 162 6,043 501,675
1967 October 2 October 21 18 162 6,042 538,585
1968 September 30 October 19 18 162 6,195 581,475
1969 September 29 October 18 18 162 6,322 589,243
1970 October 5 October 24 18 162 6,632 634,162
1971 September 13 October 2 18 162 6,099 580,918
1972 September 11 September 30 18 162 5,958 588,902