How many more, in percent, commuters drove to work alone in 2009 compared to 1990?
return commuters ;return #1 that drove to work alone ;return #2 in  2009 ;return #2 in  1990 ;return percent of #3 ;return percent of #4 ;return difference of #5 and  #6
['select', 'filter', 'filter', 'filter', 'project', 'project', 'arithmetic']