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1 October 1996–31 August 1997
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(hiatus from 31 August 1997 to 6 December 1998)
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7 December 1998–18 November 2001
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19 November 2001–27 October 2002
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28 October 2002–13 July 2003
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14 July 2003–15 January 2006
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16 January 2006–19 August 2008
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20 August 2008–13 January 2013
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14 January 2013–11 August 2015
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12 August 2015–present
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