How many percent difference is the national average of the immigrant population growth from 1993-2008 compared to in Bergen?
return immigrant population growth from  1993-2008 ;return national average of #1 ;return #1 in  Bergen ;return percent of #2 ;return percent of #3 ;return the  difference of #4 and  #5
['select', 'aggregate', 'filter', 'project', 'project', 'arithmetic']