User:Sardanaphalus/Template:(Award\prizewinners by decade\period)

  Typical input (extracted from [[Template:Commonwealth Writers' Prize: Best Book Winners]]):

    1987–1989
      1987 [[Olive Senior]]
      1988 [[Festus Iyayi]]
      1989 [[Janet Frame]]

    1990–1999
      1990 [[Mordecai Richler]]
      1991 [[David Malouf]]
      1992 [[Rohinton Mistry]]
      1993 [[Alex Miller (writer)|Alex Miller]]
      1994 [[Vikram Seth]]
      1995 [[Louis de Bernières]]
      1996 [[Rohinton Mistry]]
      1997 [[Earl Lovelace]]
      1998 [[Peter Carey (novelist)|Peter Carey]]
      1999 [[Murray Bail]]

    2000–2009
      2000 [[J. M. Coetzee]]
      2001 [[Peter Carey (novelist)|Peter Carey]]
      2002 [[Richard Flanagan]]
      2003 [[Austin Clarke (novelist)|Austin Clarke]]
      2004 [[Caryl Phillips]]
      2005 [[Andrea Levy]]
      2006 [[Kate Grenville]]
      2007 [[Lloyd Jones (New Zealand author)|Lloyd Jones]]
      2008 [[Lawrence Hill]]
      2009 [[Christos Tsiolkas]]

    2010–2019
      2010 [[Rana Dasgupta]]
      2011 [[Aminatta Forna]]

  Possible syntax for above:
    {{ (Award\prizewinners by decade\period)
     | (award\prize)name = Commonwealth Writers' Prize: Best Book Winners
     | state = (collapsed/expanded/etc)
     | 1987 <!--(startyear, so default first group should be calculated to be group1=1987–1990, i.e. startyear–next year divisible by 10)-->
     | [[Olive Senior]] | [[Festus Iyayi]] | [[Janet Frame]]
     <!--1990s-->
     | [[Mordecai Richler]] | [[David Malouf]] | [[Rohinton Mistry]] | [[Alex Miller (writer)|Alex Miller]] | [[Vikram Seth]]
     | <!--1995 was [[Louis de Bernières]], but assume no prize awarded or gap of one year:--> 1996 | [[Rohinton Mistry]] | [[Earl Lovelace]]
     | [[Peter Carey (novelist)|Peter Carey]] | [[Murray Bail]]
     <!--2000s-->
     | [[J. M. Coetzee]] | ...etc...
     <!--2010s-->
     | [[Rana Dasgupta]] | [[Aminatta Forna]]
    }}