In which year did less Dutch people identify as Christian, 2015 or 2006?
return Dutch people ;return #1 that identify as Christian ;return #2 in  2015 ;return #2 in  2006 ;return number of  #3 ;return number of  #4 ;return which is less of #5 ,  #6
['select', 'filter', 'filter', 'filter', 'aggregate', 'aggregate', 'comparison']