Thereby infant mortality rates decreased  exponentially over the years. While in 1700, roughly 54% of children survived to adulthood,   today over 95% attain physical maturity.

因此，多年来婴儿死亡率呈指数下降。 在 1700 年，大约 54% 的儿童存活到成年， 而今天超过 95% 的儿童达到了身体成熟。