How many years passed between Liu Xiaobo receiving the 2010 Nobel Peace Prize and the crackdown against peaceful Chinese jasmine protests?
return Liu Xiaobo receiving the  2010 Nobel Peace Prize ;return the  crackdown against peaceful Chinese jasmine protests ;return year of #1 ;return year of #2 ;return difference of #3 and  #4
['select', 'select', 'project', 'project', 'arithmetic']