How many triple-header rounds occurred after the first non-championship round on the 4.304 km motorsport race track named after the Rodriguez racing drivers, before its finish in 2016?
2015–16 NACAM Formula 4 Championship:  It began on 1 November 2015 with a non-championship round at the Autódromo Hermanos Rodríguez in Mexico City, and finished on 25 June 2016 at the same venue after seven triple-header rounds. Autódromo Hermanos Rodríguez: The Autódromo Hermanos Rodríguez is a 4.304 km motorsport race track in Mexico City, Mexico, named after the racing drivers Ricardo and Pedro Rodríguez.
seven