How many more persons will be populating Western Asia by 2030 than in 2008?
return Western Asia ;return populating persons of #1 ;return #2 in  2030 ;return #2 in  2008 ;return number of  #3 ;return number of  #4 ;return the  difference of #5 and  #6
['select', 'project', 'filter', 'filter', 'aggregate', 'aggregate', 'arithmetic']