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1 September 1990–5 October 1999
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(hiatus from 5 October 1999 to 14 September 2003)
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15 September 2003–3 September 2004
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4 September 2004–September 2005
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October 2005–3 June 2007
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4 June 2007–29 August 2010
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30 August 2010–30 November 2014
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1 December 2014–present
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