Definition: Answer the question from the given passage. Your answer should be directly extracted from the passage, and it should be a single entity, name, or number, not a sentence.
Input: Passage: Historically, Victoria has been the base for the manufacturing plants of the major car brands Ford, Toyota and Holden; however, closure announcements by all three companies in the 21st century will mean that Australia will no longer be a base for the global car industry, with Toyota's statement in February 2014 outlining a closure year of 2017. Holden's announcement occurred in May 2013, followed by Ford's decision in December of the same year (Ford's Victorian plants—in Broadmeadows and Geelong—will close in October 2016). Question: When did Holden announce that it will close its Victoria plant?
Output:
May 2013