How many fewer people did Roskilde have in 1753 than in 1536?
return Roskilde ;return people of #1 ;return #2 in  1753 ;return #2 in  1536 ;return the  number of  #3 ;return the  number of  #4 ;return the  difference of #6 and  #5
['select', 'project', 'filter', 'filter', 'aggregate', 'aggregate', 'arithmetic']