May 4th, 2009 is the 90th anniversary of the "May 4th Movement", so what year did the "May 4th Movement" take place?
2009年5月4日是"五四运动"的90周年纪念日，那么"五四运动"发生在哪一年呢？
<gadget id="calculator">2_009 - 90</gadget>
<output>1_919</output>

<result>1_919</result>