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1 October 1996–30 April 1998
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1 May 1998–30 April 2002
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15 October 2006–27 April 2008
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28 April–5 October 2008
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6 October 2008–21 February 2010
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22 February 2010–6 March 2011
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7 March 2011–March 2013
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March 2013–10 February 2016
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11 February 2016–1 September 2019
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2 September 2019–present
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