Did more households have a car in 2015 or in 2016?
return households in  2015 ;return households in  2016 ;return #1 that have a car ;return #2 that have a car ;return number of  #3 ;return number of  #4 ;return which is more of #5 ,  #6
['select', 'select', 'filter', 'filter', 'aggregate', 'aggregate', 'comparison']