query: #defaultView:LineChart
  # number of persons per QID (using P735=Q4925477)
  # by Jura1, 2017-08-27
  SELECT ?n (COUNT(?item)*72 as ?ct)
  {
      ?item wdt:P735 wd:Q4925477 ; wdt:P31 wd:Q5 .
      BIND(ROUND(xsd:integer(strafter(str(?item),"y/Q"))/1000000) as ?n)
  }
  GROUP BY ?n