Who runs in the USATF NE GP?

Here is the participation data and the Iron Runner spreadsheet is attached.

	13.1m	15k	5k	8k	10m	10km
USATF	538	433	325	289	336	371
Only this race	161	76	46	34	54	48
% only this race	29.9%	17.6%	14.2%	11.8%	16.1%	12.9%
Total who did
6	5	4	3	2	1
75	51	73	139	228	419	986 Unique finishers