query: #count number of people with History of Parliament identifiers
  #also count total number of identifiers used out of 21399 total (many people have two or three) 
  #for more complex figures see nightly report at http://www.generalist.org.uk/wikidata/
  
  SELECT  (COUNT(DISTINCT ?subject) AS ?distinct_people )
  		(COUNT(?subject) AS ?identifiers )
  		(21399-?identifiers AS ?identifiers_remaining)
  		(100*?identifiers/21399 AS ?percent_identifiers)
  
  WHERE
  {
      ?subject wdt:P1614 ?id .
      ?subject wdt:P31 wd:Q5 .
  }
  