query: SELECT
    (wd:Q2481549 as ?item) 
    ("decade" as ?xAxisTitle) 
    ("people born in decade" as ?yAxisTitle)
    (GROUP_CONCAT(?decade;separator=",") as ?x)
    (GROUP_CONCAT(?count_all;separator=",") as ?y)
    ("area" as ?type)
    ("200" as ?heigth) 
    ("600" as ?width) 
  WHERE
  {
    { SELECT ?decade (COUNT(DISTINCT ?item) as ?count_all)
    {
      ?entry wdt:P1433 wd:Q665807 ; wdt:P921 ?item .
      ?item wdt:P569 ?d . 
      FILTER( YEAR(?d) > 1499 && YEAR(?d) < 1890 )
      BIND( FLOOR( YEAR(?d)/10) *10 as ?decade) 
      ?item wdt:P31 wd:Q5 .
    }
    GROUP BY ?decade
    ORDER BY DESC(?decade)
    }
  }