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15 January 2003–30 September 2007
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1 October 2007–January 2008
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January 2008–8 June 2009
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9 June 2009–2 September 2010
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3 September 2010–31 January 2011
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1 February 2011–18 April 2016
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19 April 2016–8 October 2017
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9 October 2017–6 April 2020
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7 April 2020–present
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