Answer:
The period between 1340 and 1450 saw more deaths in Western than in Eastern Europe.
The percentage of population decline during this period was 31.97%.
Step-by-step explanation:
During the period between 1340 and 1450 Europe was facing the plague that arrived from Asia. All of the continent had very big losses in population, with Western Europe being the most affected of them all. Western Europe lost around one third of its total population, while Eastern Europe for comparison lost around one quarter of its population, which was still a lot. The total population of the continent decreased by 31.97%. This led to big weakening of the European countries, especially when it came to economy and military power, but it also triggered major changes in the societies.