From the 1980s to the early 2000s, birth rates in high and middle-income countries were stable, or at least stabilising. But over the last 10 to 15 years, across a wide range of regions, cultures, and level of economic development, they've gone into steep decline. In more than two-thirds of the world's 195 countries, the average number of children born to each woman is now below the replacement rate of 2.1. In 66 countries, the average is closer to 1 than to 2. And in some, the most common number of children born to each woman is now 0.
从上世纪80年代到本世纪初，高收入和中等收入国家的出生率保持稳定，至少正在趋稳。但过去10到15年里，跨越不同地区、文化和manbetx20客户端下载 发展水平，出生率都急剧下滑。在manbetx app苹果 195个国家中，超过三分之二的国家每名女性平均生育子女数已低于2.1的世代更替水平。在66个国家，这一平均值更接近1而不是2。在一些国家，每名女性最常见的生育子女数如今是0。
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