How many percentage points less after-tax income did the top 1% have than pre-tax income in 2007?
return top 1 % ;return #1 in  2007 ;return after-tax income  of #2 ;return pre-tax income  of #2 ;return percentage points of #3 ;return percentage points of #4 ;return the  difference of #6 and  #5
['select', 'filter', 'project', 'project', 'project', 'project', 'arithmetic']