It is impossible to answer this question because historians do not have comprehensive records of the death toll for every country that was affected by the Black Death. Essentially, some areas kept records and some did not. Instead, historians have estimated that the population of Europe, as a whole, was decimated by the plague, with a total population loss of between one-third and 50%.
However, historians have noted that the Black Death affected some areas more than others. According to these statistics from Carson-Newman University, the death rate in the Italian city of Florence was 90%—this is the highest known figure. In addition, the French town of Caux in Normandy reportedly lost 66% of its population. Compare this to England, which had a mortality rate of between 30% and 40%, and you get a better understanding of these figures.
What we can say, then, is that France and Italy suffered greatly from the Black Death, with some towns and cities losing well over half of their residents.