Question: In what year did this Argentine dancing competition begin airing, in which Bailando 2012 was its eighth Argentinean season?

Context articles: X Factor (Romania season 2)
Bailando por un Sueño (Argentina season 1)
Bailando 2012
Bailando Kids
Soñando por Bailar 2012
Bailando 2011
Bailando por un Sueño (Argentine TV series)
Bailando por un Sueño (Argentina season 3)
Bailando por un Sueño 2008
Bailando por un Sueño (Argentina season 2)

X Factor is a Romanian television music competition that aims to find a new music talent to become a star.
 The second season will begin airing in the fall of 2012 on Antena 1.
 The winner will receive a prize of €200,000.
Bailando por un Sueño 1 was the first Argentinean season of "Bailando por un Sueño".
Bailando 2012 was the eighth Argentinean season of "Bailando por un Sueño".
 The first show of the season aired on June 11, 2012 on El Trece, with Marcelo Tinelli as host and 30 couples competing.
Bailando Kids is an Argentine dancing competition show on the show "Bailando por un Sueño" (which is, at the same time, the Argentine version of "Dancing with the Stars") involving couples composed of children from 7 to 12 years old who are judged by a jury.
 It was broadcast by El Trece and the host was Marcelo Tinelli during the first three weeks and then José María Listorti during the next four.
 It premiered on May 7, 2009 and the season finale was on June 19, 2009.
 The show was strongly criticized by various sectors for manipulation of the child competitors.
Soñando por Bailar 2012 was the second season of "Soñando por Bailar", an Argentinian reality show broadcast by El Trece.
 Unlike the first season, this time the contestants were professional dancers and every week they received a score from 1 to 10.
 The winner of the show got the chance to dance in "Bailando 2012" (as the first winner, Eugenia Lemos, who was a contestant in "Bailando 2011").
Bailando 2011 was the seventh Argentinean season of "Bailando por un Sueño".
 The season premiere aired on May 16, 2011 on El Trece with 30 couples, including same-sex pairs for the first time in the Argentinean show– José María Muscari in the male couple; in the female couple, initially Silvina and Vanina Escudero, then Silvina Escudero and Sofía Pachano– and, for the first time in the world, a contestant with dwarfism: Noelia Pompa, a singer.
Bailando por un Sueño (literally "Dancing for a dream"; known simply as Bailando) is an Argentine dancing competition show airing since 2006 as part of the "Showmatch Franchise" on El Trece.
 The show is the Argentine version of the Mexican television series of the same name.
 Marcelo Tinelli is the Martín Fierro-winning host in each season, as well in all of the spin-off shows derived from this one like "Cantando por un Sueño" (2006-2007;2011-2012), "Patinando por un Sueño" (2007-2008), "El Musical de tus Sueños" (2009), "Bailando Kids" (2009) and "Soñando por Bailar" (2011-2012).
Bailando por un Sueño 3 was the third Argentinean season of "Bailando por un Sueño".
 The first show of the season aired on October 2, 2006 and was part of the original show broadcast as "Showmatch" on Canal 13 and hosted by Marcelo Tinelli, as well as the previous season that had finished a month before.
 This time, there were 15 couples competing, and the competition lasted 12 weeks.
 The winner was revealed on the season finale, on December 21, 2006: model, TV host and actress Carla Conte, who was paired with the professional dancer, Guillermo Conforte.
Bailando por un Sueño 2008 was the fifth Argentinean season of "Bailando por un Sueño".
Bailando por un Sueño 2 was the second Argentinean season of "Bailando por un Sueño".