How many years oassed from when the Spanish colonists discovered silver to when the Pima tribes and successfully drove the colonists out?
return the  Spanish colonists  discovered silver ;return the  Pima tribes successfully drove the   colonists  out ;return year of #1 ;return year of #2 ;return the  difference of #4 and  #3
['select', 'select', 'project', 'project', 'arithmetic']