query: SELECT
    (wd:Q2481549 as ?item) 
    ("area" as ?type)
    ("800" as ?width) 
    ("200" as ?heigth) 
    ("date of publication (2 January 2020 -> today)" as ?xAxisTitle) 
    ("count" as ?yAxisTitle)
    ("date" as ?xType) 
    (GROUP_CONCAT(?date;separator=",") as ?x)
    (GROUP_CONCAT(?count;separator=",") as ?y)
  WHERE
  {
    { SELECT ?date (COUNT(DISTINCT ?entry) as ?count)
    {
      ?entry wdt:P8150 [] .
      ?entry wdt:P577 ?date . 
      FILTER( ?date <= Now() && ?date > "2020-01-01T00:00:00Z"^^xsd:dateTime )
    }
    GROUP BY ?date
    ORDER BY DESC(?date)
    }
  }