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8 June 1988–4 February 1989 (pre-launch)
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5 February 1989–1 November 1990
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2 November 1990–31 August 1993
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1 September 1993–31 August 1995
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1 September 1995–30 August 1996
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31 August 1996–September 1997
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September 1997–30 September 1998
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1 October 1998–2000
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2000–30 September 2001
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1 October 2001–18 April 2004
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19 April 2004–23 October 2005
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24 October 2005–30 October 2007
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31 October 2007–2 April 2008
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3 April 2008–3 February 2009
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4 February 2009–21 April 2010
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22 April 2010–25 June 2012
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26 June 2012–11 August 2013
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12 August 2013–6 May 2015
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7 May 2015–15 January 2018
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16 January 2018–2021
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