Japan’s population in the next 100 years will be cut by more than half to 51 million people, or about the same number now in California and Ohio, a forecast says.

The Asian country is trying to boost its birth rate, but that won’t stop a 31 percent decline to 88 million people by 2065 and a 60 percent drop by 2115, the National Institute of Population and Social Security Research says.

“The figures show a population decline is set to transform Japan unless Tokyo opts for large-scale immigration, given decades of low birth rates since the 1960s,” according to the Financial Times, which cites the study. “But while the long-term picture remains gloomy, the latest forecasts show a modestly slower pace of decline, as women in their thirties choose to have more babies.”

Japan’s population is estimated to fall below 100 million by 2053, instead of 2048, the research