At the start of 2024, 4.3 births and two deaths are expected worldwide every second: US Census Bureau The world population grew by 75 million people over the past year and on New Year’s Day it will stand at more than 8 billion people, according to figures released by the US Census Bureau on Thursday. The worldwide growth rate in the past year was just under 1 percent. At the start of 2024, 4.3 births and two deaths are expected worldwide every second, according to the Census Bureau figures. The US growth rate in the past year was 0.53 percent, about half the worldwide figure. The US added 1.7 million people and will have a population on New Year’s Day of 335.8 million people. If the current pace continues through the end of the decade, the 2020s could be the slowest-growing decade in US history, yielding a growth rate of less than 4 percent over the 10-year-period from 2020 to 2030, said William Frey, a demographer at The Brookings Institution. The slowest-growing decade currently was in the aftermath of the Great Depression in the 1930s, when the growth rate was 7.3 percent. “Of course growth may tick up a bit as we leave the pandemic years. But it would still be difficult to get to 7.3 percent,” Frey said. At the start of 2024, the United States is expected to experience one birth every nine seconds and one death every 9.5 seconds. However, immigration will keep the population from dropping. Net international migration is expected to add one person to the US population every 28.3 seconds. This combination of births, deaths and net international migration will increase the US population by one person every 24.2 seconds.