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2 December 1990–31 December 1992
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1 January 2000–2003
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20 June 2005–28 February 2007
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1 March 2007–15 August 2010
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16 August 2010–31 January 2011
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1 February 2011–20 February 2012
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21 February 2012–8 June 2015
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9 June 2015–18 April 2016
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19 April 2016–8 October 2017
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9 October 2017–6 April 2020
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7 April 2020–present
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