How many fewer people were Roman Catholic in 2011 compared with 1992?
return people ;return #1 that were Roman Catholic ;return #2 in  2011 ;return #2 in  1992 ;return number of  #3 ;return number of  #4 ;return difference of #6 and  #5
['select', 'filter', 'filter', 'filter', 'aggregate', 'aggregate', 'arithmetic']