How many more dollars did Frederick W. Smith earn in total compensation  in 2008 than 2009?
return Frederick W. Smith ;return total compensation of #1 ;return #2 in  2008 ;return #2 in  2009 ;return the  dollars of #3 ;return the  dollars of #4 ;return the  difference of #5 and  #6
['select', 'project', 'filter', 'filter', 'project', 'project', 'arithmetic']