In 2017, the population of China was about 1.39 billion people, and the population growth rate was about 0.6% per year. Assuming the population of China continues to grow exponentially at this rate, the expected population of China, in billions of people, t years after 2017, is given by the exponential function P(t) = 1.39e^0.006t. Use this function to predict the population of China in the year 2025.