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6 June 1991–16 December 1992
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17 December 1992–13 September 1994
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(hiatus from 13 September 1994 to 11 August 2005)
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12 August 2005–28 September 2008
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29 September 2008–5 December 2010
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6 December 2010–3 January 2011
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4 January 2011–4 January 2015
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5 January 2015–29 April 2018
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30 April 2018–present
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