What countries of East Asia has the lowest population groth rate out china japan North Korea and Mongolia?

According to the latest data from the World Bank, the population growth rate of China, Japan, North Korea, and Mongolia in 2020 are:

China: 0.39%

Japan: -0.53%

North Korea: 0.44%

Mongolia: 1.26%

Therefore, Mongolia has the lowest population growth rate out of these four countries.