Question: The Dutch-Belgian television series that "House of Anubis" was based on first aired in what year?

Context paragraphs:
House of Anubis: House of Anubis is a mystery television series developed for Nickelodeon based on the Dutch-Belgian television series "Het Huis Anubis".  The series was created by Hans Bourlon and Gert Verhulst and premiered on Nickelodeon on 1 January 2011 in the United States and on 25 February 2011 in the United Kingdom.  The series is the first series from the network to be filmed outside the United States and the first telenovela-format series for the network.  The show aired from 1 January 2011 to 17 June 2013.

Batibot: Batibot was a Philippine children's television series produced by PCTV and based on "Sesame Street".  It was first aired in 1984 on RPN as "Sesame!"  and was co-produced by Children's Television Workshop ("now known as" Sesame Workshop) but the partnership broke up.  "Sesame!"  later aired as "Batibot" in 1985, a full Filipino language series.  It aired until 1998 and was aired in at least four television networks.  TV5 later revived the show and aired it from 2010–2013.  A mobile app based on the series was released in 2015.

Wolfblood: Wolfblood is a British–German fantasy teen drama television series targeted at a young adult audience.  Created by Debbie Moon, it is a co-production between CBBC and ZDF/ZDFE.  The television series revolves around the life of the species known as wolfbloods.  They are creatures that have enhanced senses and look like humans but at can turn at will into wolves.  Their transformation is uncontrolled during a full moon, and they are at their weakest during "the dark of the moon", at a new moon.  The television series focuses on their daily life and the challenges that they face to hide their secret.  Each series has new characters and concepts and overall the television series has an interesting storyline.  To date, five complete series have aired.  Series 1 first aired on 10 September 2012 and concluded on 22 October 2012 and consisted of 13 episodes.  Series 2 first aired on 9 September 2013 and concluded on 21 October 2013 and again consisted of 13 episodes.  Series 3 first aired on 15 September 2014 and concluded on 27 October 2014 and also consisted of 13 episodes.  Series 4 first aired on 8 March 2016 and concluded on 13 April 2016 and this time consisted of 12 episodes.  A fifth season was announced on 6 June 2016 and began airing on 27 February 2017 and concluded on 1 May 2017 with 10 episodes.

List of House of Anubis episodes: This article is an episode list for "House of Anubis", a mystery/comedy-drama television series broadcast on Nickelodeon.

Majisuka Gakuen: Majisuka Gakuen (マジすか学園 ) (lit.  "Majisuka Academy") is a Japanese television drama series first aired on TV Tokyo starring AKB48.  A second season Majisuka Gakuen 2 was aired the following year, the 3rd Season was aired on July 13, 2012.  In 2015, the series moved to NTV and the 4th Season was aired on January 19, 2015.  On the same year, a 5th Season was announced and for the first time will be aired exclusively on internet, by the streaming site Hulu (only in USA & Japan), because NTV will broadcast only the first two episodes (August 24), due to various scenes of violence, which does not justify full season showing on TV, because there may be many problems.  A special spin-off from the 4th and 5th season of the series titled "Majisuka Gakuen 0: Kisarazu Rantōhen" (マジすか学園0 木更津乱闘編 ) (lit.  "Majisuka Academy 0: The story of the Brawl at Kisarazu") which first to feature HKT48 as the main cast and first to have a collaboration with the rock group Kishidan.  It was aired on November 28, 2015 on NTV at 25:05 JST and run for half an hour.

Graduation Day (Buffy the Vampire Slayer): "Graduation Day" is the season finale of the WB Television Network's third season of the drama television series "Buffy the Vampire Slayer", consisting of the twenty-first and twenty-second episodes.  They were written and directed by series creator Joss Whedon.  "Part 1" first aired on May 18, 1999 and "Part 2" first aired on July 13, 1999.  The second part was to originally be aired on May 25, 1999, but was postponed due to the episode's content and the occurrence of the Columbine High School shootings one month prior.

Fish Police (TV series): Fish Police is an animated television series from Hanna-Barbera based on the comic book series created by Steve Moncuse.  It first aired on CBS in 1992, lasting six episodes over one season.  In February of that year, three episodes aired, then the show was axed after falling in the television ratings.  The remaining three episodes never aired in the United States, but the entire series ran in European syndication.  The show had a decidedly more mature tone than most other animated Hanna-Barbara shows.  Episodes often contained innuendo and cases of mild profanity.

Nathalia Ramos: Nathalia Norah Ramos Cohen (born July 3, 1992) is a Spanish-Australian actress, who also holds U.S. citizenship.  Ramos is known for her portrayals of Yasmin in the 2007 film "", Jill in the 2013 film "The Damned", and lead character Nina Martin in the 2011 Nickelodeon television series "House of Anubis".

Het Huis Anubis: Het Huis Anubis ("The House of Anubis") is a Belgian-Dutch children's television drama created by Studio 100 and Nickelodeon, airing in the Netherlands and Flanders.  It first aired in September 2006 and the last episode was broadcast on December 4, 2009.  The show was a huge success in the Benelux, despite the show's low budget for the first two seasons.

Das Haus Anubis: Das Haus Anubis is a television program produced jointly by Belgian broadcaster Studio 100 and Nickelodeon and the first remake of Het Huis Anubis aired in The Netherlands and Belgium.  Another English remake called House of Anubis aired in 2011.  With a seven-figure production budget, it is one of Nickelodeon's largest in-house productions, and the first German daily soap opera specifically aimed at older children.  From 29 September 2009 to 4 May 2012, the show had been running both on children's channel Nick (daily at 7:40pm, and repeated in the afternoon and at weekends), and season 1 on music channel VIVA.

Supporting paragraphs: House of Anubis Het Huis Anubis
Answer: 2006