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In page Demographics of China:

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In 1949 crude death rates were probably higher than 30 per 1,000, and the average life expectancy was only 35 years. Beginning in the early 1950s, mortality steadily declined; it continued to decline through 1978 and remained relatively constant through 1987. One major fluctuation was reported in a computer reconstruction of China's population trends from 1953 to 1987 produced by the United States Bureau of the Census. The computer model showed that the crude death rate increased dramatically during the famine years associated with the Great Leap Forward (1958–60).[citation needed]