<populationsize>
 <size>
   <age>0</age>
   <sex>0</sex>
   <number>500</number>
 </size>
 <size>
   <age>0</age>
   <sex>1</sex>
   <number>300</number>
 </size>
 <size>
   <age>1</age>
   <sex>0</sex>
   <number>200</number>
 </size>
 <size>
   <age>1</age>
   <sex>1</sex>
   <number>400</number>
 </size>
 <size>
  <age>10</age>
  <sex>0</sex>
 </size>
</populationsize>
