noun
birthrate
Refers to the number of live births per population, often per 1,000 people per year.
日本の出産率は年々低下している。
Japan's birthrate is declining year by year.
出生率 is a more formal demographic term for birthrate, while 出産率 is slightly more common in everyday contexts.
Compound of 出産 (childbirth) and 率 (rate).