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In 1900, the crude birth rate in the area of modern-day North Korea was estimated to be approximately 42 births per thousand people, meaning just over 4.2% of the population was born in that year. This rate would remain largely unchanged for the first few decades of the 20^th century, but would fluctuate greatly in the between the 1940s and 1970s, due to the impact of the Second World War in the 1930s and 1940s, followed by the devastating Korean War in the early 1950s, and then the period of instability and adjustment that followed the war. After falling to just under 21 births per thousand people by 1980, the crude birth rate would remain largely stable until the turn of the century, before falling below 14 births per thousand people.