How many less inhabitants by 1753 in Roskilde than in 1536?
return Roskilde ;return inhabitants of #1 ;return #2 in  1753 ;return #2 in  1536 ;return number of  #3 ;return number of  #4 ;return difference of #6 and  #5
['select', 'project', 'filter', 'filter', 'aggregate', 'aggregate', 'arithmetic']