Question: What was the first year the NinjaTel van's model released?
Context: Van Kleef Aquarium was an oceanarium located in Fort Canning Park facing River Valley Road in Singapore.  The aquarium was opened in September 1955 and demolished in 1998.  The aquarium was named after Karl Willem Benjamin Van Kleef who was Dutch but resided in Singapore in the 19th and early 20th century.  Van Kleef donated his fortune to the Singaporean government to build the aquarium after his death.  When the aquarium opened it contained 6,500 marine creatures of 180 different species.  There were salt water, fresh water and swamp water tanks.  The building was fully air-conditioned.  270,000 visitors came in its first year of operation.  During the 1970s the average number of visitors was about 400,000 annually.  Visitor numbers fell to 248,000 in 1985.  The aquarium underwent major renovations from 1986 to 1987.  The aquarium was closed during the renovations which cost S$750,000.  Unfortunately the number of visitors never reached the peak of the 1970s again.  In 1991 Underwater World opened on Sentosa island.  Most visitors went to the new aquarium.  This led to the decision by the Ministry of National Development of Singapore to close the Van Kleef Aquarium in 1991.  The building was demolished in 1996. The Gray was an automobile manufactured in Detroit, Michigan by the Gray Motor Corporation from 1922-26.  The Gray Motor Corporation produced two models, the Star and Gray.  They were an attempt to win a share of the mass market dominated by Ford Model T.  Many of the employees of Gray, were former Ford employees, including the head of Gray Corporation, Frank L. Klingensmith, who was the former vice president and treasurer of Ford Motor Company.  The vehicles had similar features of engine and chassis to the Model T.  The engine had a side-valve, four-cylinder 2.7 litre configuration.  The suspension used a conventional quarter-elliptical spring at the front and rear.  Front-wheeled brakes were offered in 1926, the last year of production.  They planned on production of nearly a quarter of a million a year the first year, but those volumes were never realized.  The touring car cost $490, and the coach was sold at $760, the first year of production. The Pentax K-7 is a 14.6-megapixel digital single-lens reflex camera, announced on 20 May 2009.  This is the first new flagship model released by Pentax since its merger with Hoya Corporation on 31 March 2008.  It was discontinued late in 2010 in favour of the K-5. The 2011 7-Dorpenomloop Aalburg also known as the Verti advies 7-Dorpenomloop van Aalburg due to sponsorships reasons was the fifth running of the women's 7-Dorpenomloop Aalburg, an elite women's bicycle race in Aalburg, the Netherlands.  It was held on 28 May 2013 over a distance of 121.2 km , starting and finishing in Aalburg.  It was rated by the UCI as a 1.2 category race.  It was the first year that the race was a UCI 1.2 category race so it was also the first year that the race was part of the 2011 UCI women's cycling calendar. Voxan is a French motorcycle manufacturer established in Issoire, France, in 1995.  Initiated by Jacques Gardette, the project was to build the first French motorcycle company in the global market involving different partners.  Alain Chevallier designed the chassis, while Sodemo Moteurs focused on the engine.  The first prototype was shown in 1997, and the first production model released in 1999. The Mamiya RZ67 is a medium format single-lens reflex system camera manufactured by Mamiya.  There are three successive models: the RZ67 Professional (first model released in 1982), RZ67 Professional II (released in 1995) and RZ67 Professional IID (released in 2004).  RZ67 is a modular camera system, meaning lenses, viewfinders, ground glasses, film winders and film backs are all interchangeable.  It is primarily designed for studio use, but can also be used in the field.  The RZ67 Sekor lenses have built-in electronic leaf shutters which are cocked and triggered from the body.  Focusing is performed with a bellows on the body instead of the lenses. The Ford E-Series (also known as the Ford Econoline and Ford Club Wagon throughout various stages of its production) is a range of full-size vans produced by Ford Motor Company.  Introduced for the 1961 model year as the replacement for the Ford F-Series panel van, four generations of the model line have been produced.  In addition to cargo van and passenger van body styles, the Ford E-Series has been produced as a cutaway van chassis and stripped chassis (a chassis without bodywork). The NinjaTel Van is a 2001 Ford Econoline E250 van, designed and converted by Bob "saberfire" Bristow and Colleen "Phar" Campbell into the base of operation for NinjaTel.  From July 26 to July 29, 2012 the Ninja Networks team created and operated a mobile cell phone network from a van placed in the Vendor area of DEF CON 20, at the Rio Hotel/Casino in Las Vegas, and the Ninja Party, at Rumor Boutique Hotel in Las Vegas.  NinjaTel served a small network of 650 GSM phones using custom SIM cards. Van Merksteijn Motorsport is a Dutch motorsport company active in both circuit racing and rallying.  Established in 2008, under the ownership of Peter van Merksteijn Sr. and with Gerard Grouve as team principal, this motorsport company won both the LMP2 class title in the prestigious 24 Hours of Le Mans and in the gruelling the Le Mans Series in its first year of competition.  Only one year later the team from Hengelo were again unbeatable when contesting the Dutch Rally Championship.  For the 2011 season, the team has once more undertaken very ambitious plan: Peter van Merksteijn Jr. will compete in the World Rally Championship alongside Peter van Merksteijn Sr. driving a Citroën DS3 WRC. The ThinkStation products from Lenovo are professional workstations designed for high-end computing.  In 2008, Lenovo expanded the focus of its “THINK” brand to include workstations, with the ThinkStation S10 being the first model released.  In 2014, Lenovo introduced the P Series workstations.
Answer: 1961