Question: 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?

Context paragraphs:
2016 Australian Formula 3 Premier Series: The 2016 Australian Formula 3 Premier Series is an Australian motor racing competition for cars constructed in accordance with FIA Formula 3 regulations.  It is sanctioned by the Confederation of Australian Motor Sport (CAMS) as an Authorised Series, with Formula 3 Management Pty Ltd appointed as the Category Manager.  The series began on 2 April at Sandown Raceway and will end on 13 November at Sydney Motorsport Park, after seven triple-header rounds across three states.  This was the first Australian Formula 3 Premier Series to be contested, with the Australian Formula 3 Championship having been discontinued at the end of 2015.

2015–16 NACAM Formula 4 Championship: The 2015–16 NACAM Formula 4 Championship season is the inaugural season of the 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.

Fuji Speedway: Fuji Speedway (富士スピードウェイ , Fuji Supīdowei ) is a motorsport race track standing in the foothills of Mount Fuji, in Oyama, Suntō District, Shizuoka Prefecture, Japan.  It was built in the early 1960s.  In the 1980s, Fuji Speedway was used for the FIA World Sportscar Championship and national racing.  Originally managed by Mitsubishi Estate Co., Fuji Speedway was acquired by Toyota Motor Corporation in 2000.  The circuit hosted the Formula One Japanese Grand Prix in 2007, after an absence of 30 years, replacing the Suzuka Circuit, owned by Honda.  After Fuji Speedway hosted the 2008 race, the Japanese Grand Prix returned to Suzuka for the 2009-onward races.  Fuji Speedway has one of the longest straights in motorsport tracks, at 1.475 km in length.  The circuit has FIA Grade 1 license.

Torque (magazine): Torque magazine is a monthly motorsport magazine which is published by The Race Drivers Academy in the United Kingdom.  It was first released in September 2008.  The magazine's tag line is that it is 'By Drivers, For Drivers'.  The magazine is written solely by racing drivers and includes interviews, guest columnists and articles written by other racing drivers.  Whilst the main objective initially was to document news and mini biographies of The Race Drivers Academy's drivers, "Torque" has since attracted some top motorsport celebrities for interviews and its open stance on many issues has seen it become popular amongst hardcore racing fans.  "Torque" prides itself in being open and honest in its views on the motorsport world.

Ciudad del Motor de Aragón: The Ciudad del Motor de Aragón, also known as Motorland Aragón, is a 5.344 km motorsport race track located in Alcañiz, Spain.

Salzburgring: The Salzburgring is a 4.225 km motorsport race track located in Koppl, east of Salzburg.

Circuit Zolder: The Circuit Zolder, also known as Circuit Terlamen, is an undulating 4.011 km motorsport race track in Heusden-Zolder, Belgium.

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.  The circuit got its name shortly after it opened when Ricardo Rodríguez died in practice for the non-Championship 1962 Mexican Grand Prix.  Ricardo's brother Pedro also lost his life behind the wheel nine years later.  Since 2015 the track once again is a host of the Formula One Mexican Grand Prix, an event it previously hosted in two separarate time periods on a different layout, the last occasion of which was in 1992.

2017 V de V Challenge Monoplace: The 2017 V de V Challenge Monoplace was a multi-event motor racing championship for open wheel, formula racing cars held across Europe.  The championship features drivers competing mainly in 2 litre Formula Renault single seat race cars that conform to the technical regulations for the championship.  The season began at Circuit de Barcelona-Catalunya on 17 March and will finish on 5 November at Estoril after seven triple-header rounds.

2016 in motorsport: The following is an overview of the events of 2016 in motorsport, including the major racing events, award ceremonies, motorsport venues that were opened and closed during a year, championships and non-championship events that were established and disestablished in a year, births and deaths of racing drivers and other motorsport people.

Supporting paragraphs: 2015–16 NACAM Formula 4 Championship Autódromo Hermanos Rodríguez
Answer: seven