From July 1, 1921, when the Communist Party of China was founded, to July 1, 2000, how many years is it?
1921年7月1日中国共产党成立，到2000年7月1日是多少周年．
<gadget id="calculator">2_000 - 1_921</gadget>
<output>79</output>

<result>79</result>