July 1, 2011 is the 90th anniversary of the founding of the Communist Party of China. How many years was the Communist Party of China established on July 1?
2011年7月1日是中国共产党建党90周年，中国共产党是多少年7月1日成立的．
<gadget id="calculator">2_011 - 90</gadget>
<output>1_921</output>

<result>1_921</result>