You will be given a definition of a task first, then some input of the task.
This task involves creating answers to complex questions, from a given passage. Answering these questions, typically involve understanding multiple sentences. Make sure that your answer has the same type as the "answer type" mentioned in input. The provided "answer type" can be of any of the following types: "span", "date", "number". A "span" answer is a continuous phrase taken directly from the passage or question. You can directly copy-paste the text from the passage or the question for span type answers. If you find multiple spans, please add them all as a comma separated list. Please restrict each span to five words. A "number" type answer can include a digit specifying an actual value. For "date" type answers, use DD MM YYYY format e.g. 11 Jan 1992. If full date is not available in the passage you can write partial date such as 1992 or Jan 1992. If you find multiple spans, please add them all as a comma separated list. Please restrict each span to five words.

Passage: On 17 January 2011, it was announced that Motorhead would be part of the Sonisphere Festival in Knebworth. In August 2011, they headlined the Brutal Assault open-air festival in the Czech Republic. On 2 March 2011 Motorhead performed on Late Night with Jimmy Fallon. On 9 July 2011, former guitarist Wurzel died of a heart attack. In celebration of 35 years touring, in late 2011 the band released the live DVD The World Is Ours - Vol 1 - Everywhere Further Than Everyplace Else, including performances at the O2 Apollo Manchester, Best Buy Theater, New York City and Teatro Caupolican, Santiago de Chile. On 19 December 2011, it was announced that Motorhead would play at the German festivals Rock am Ring and Rock im Park in Nurburgring and Nuremberg respectively in June 2012. On 12 January 2012, it was announced that Motorhead were touring the US and Canada in early 2012, along with three other metal bands Megadeth, Volbeat and Lacuna Coil. The Gigantour took place from 26 January to 28 February 2012, but Motorhead missed the final four shows because Lemmy had a combination of an upper respiratory viral infection and voice strain, resulting in severe laryngitis. Lemmy wrote on Facebook, "Im giving my voice a good rest", hoping he would recover soon to play at the Mayhem Festival, which was held from 30 June to 5 August 2012. Motorhead also took part on 23 June in the Rock-A-Field Luxembourg Open Air Festival in Roeser.
Question: How many performances for Motorhead were announced in 2011?
Answer type: Number
Output:
4.