How many more yards of fieldgoals did Stover score compared to Brown?
return Stover ;return Brown ;return fieldgoals of #1 ;return fieldgoals of #1 ;return yards of #3 ;return yards of #4 ;return sum of #5 ;return sum of #6 ;return difference of #7 and  #8
['select', 'select', 'project', 'project', 'project', 'project', 'aggregate', 'aggregate', 'arithmetic']