query: embed.html#PREFIX wdname: <http://www.wikidata.org/entity/Q64698701>
  #defaultView:LineChart
  SELECT ?year (COUNT(DISTINCT ?item) as ?ct) 
  {
      hint:Query hint:optimizer "None".
      ?item wdt:P735 wdname: ; wdt:P569 ?b . 
      ?item p:P569/psv:P569 [ wikibase:timeValue ?b ; wikibase:timePrecision ?precision ]  
      FILTER(?precision > 7 )  
      BIND( (FLOOR(YEAR(?b)/10)*10) as ?year) 
  }  
  GROUP BY ?year
  ORDER BY ?year