query: SELECT
    (wd:Q2481549 as ?item) 
    ("area" as ?type)
    ("200" as ?height) 
    ("800" as ?width) 
    ("date" as ?xType) 
    ("date of death" as ?xAxisTitle) 
    ("number of people with item" as ?yAxisTitle)
    (GROUP_CONCAT(?date;separator=",") as ?x)
    (GROUP_CONCAT(?total;separator=",") as ?y)
  WHERE
  {
    SELECT ?date (COUNT(DISTINCT ?p) as ?total)
    {
      ?p wdt:P509 wd:Q84263196 .
      ?p wdt:P570 ?date . FILTER(YEAR(?date)>2019)
      ?p wdt:P31 wd:Q5 .
      ?p p:P570 / psv:P570 [ wikibase:timeValue ?date ; wikibase:timePrecision 11 ] .
    }
    GROUP BY ?date
    ORDER BY DESC(?date)
  }