自し然ぜん増ぞう加か率りつ

noun

natural rate of increase; rate of natural increase

Demographic term for the difference between birth and death rates, excluding migration. Used in statistics and population studies.

• 日本にほんの自し然ぜん増ぞう加か率りつは近きん年ねんマイナスになっている。

  Japan's natural rate of increase has become negative in recent years.