/**
* Updates mortality rate for given year based on formula given in spec.
*
* @param year year for which we are updating mortality rate
*/
public void updateMortalityRate(int year) {
double mortalityNow = 0.;
for (AgriculturalUnit unit : entities) {
unit.updateMortalityRate(year);
mortalityNow += unit.getMortalityRate(year);
}
mortalityNow /= entities.size();
setMortalityRate(year, mortalityNow);
}
