How many billions higher was the Sochi 2014 Olympic cost than the average Winter Game cost?
return the  Sochi 2014 Winter Olympic Game ;return cost in  billions of #1 ;return Winter Olympic Game ;return costs in  billions of #3 ;return the  average of #4 ;return the  difference of #2 and  #5
['select', 'project', 'select', 'project', 'aggregate', 'arithmetic']