How many more children per woman were there in Turkey in 2010 compared to 2011?
return Turkey ;return children per woman of #1 ;return #2 in  2010 ;return #2 in  2011 ;return number of  #3 ;return number of  #4 ;return difference of #5 and  #6
['select', 'project', 'filter', 'filter', 'aggregate', 'aggregate', 'arithmetic']