After the 18th National Congress, the number of members of the Standing Committee of the Political Bureau of the Central Committee changed from 9 to 7. What percentage of the original number is the reduced number of people?
十八大以后，中央政治局常委由原来的9位变为7位．减少的人数占原来人数的几分之几？
<gadget id="calculator">9 - 7</gadget>
<output>2</output>

<gadget id="calculator">2 / 9</gadget>
<output>2/9 = around 0.222222</output>

<result>2/9 = around 0.222222</result>