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1 September 1993–2 February 1997
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3 February 1997–19 May 2002
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20 May 2002–29 June 2003
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30 June 2003–31 October 2004
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1 November 2004–September 2006
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September 2006–2 June 2008
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3 June 2008–12 September 2011
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13 September 2011–6 October 2013
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7 October 2013–22 June 2016
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23 June 2016–present
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