In 2011, my country's per capita water resources were 74.9% of 2010. How much did my country's per capita water resources decrease in 2011 compared with 2010?
2011年我国的人均水资源量是2010年的74.9%，2011年我国的人均水资源量比2010年下降了多少．
<gadget id="calculator">74.9 / 100</gadget>
<output>0.749</output>

<gadget id="calculator">1 - 0.749</gadget>
<output>0.251</output>

<gadget id="calculator">0.251 / 1</gadget>
<output>0.251</output>

<result>0.251</result>