query: SELECT ?item ?from WHERE {
    { ?item wdt:P31 wd:Q5. }
    { ?item wdt:P106 wd:Q82955. }
    { ?item p:P106 ?occupation. }
    ?occupation ps:P106 wd:Q860918.
    OPTIONAL { 
      ?occupation pqv:P580 [
          wikibase:timePrecision ?from_precision;
          wikibase:timeValue ?from_time;
        ];
    }
    BIND(YEAR(?from_time) AS ?from)
  }