Did more Central Pacific El Niños happen in the 1990s or the 2000s?
return Central Pacific El Niños ;return #1 in  the  1990s ;return #1 in  the  2000s ;return number of  #2 ;return number of  #3 ;return which is more of #4 ,  #5
['select', 'filter', 'filter', 'aggregate', 'aggregate', 'comparison']