Although this is still small compared to the figures of 17 or 18 % for Germany and Sweden, the transformation of the population structure in the West only occurred after the industrial revolution, and took one or two hundred years to reach the current situation.
雖然比之西德、瑞典的百分之十七、十八，仍是小巫見大巫。但西歐人口結構的轉變，由工業革命後就開始，花了一、兩百年才成為今天的情形。