Global human population growth This table lists the years when population milestones have been or will be reached, as estimated by demographers at the United Nations. Use it to answer the following questions. Population Size Year 3 billion 1959 4 billion 1974 5 billion 1987 6 billion 1998 7 billion 2011 8 billion 2025 9 billion 2043 10 billion 2083 The World Bank How many years did it take for the world's human population to grow from 6 billion to 7 billion? Enter your answer here: How many years will it take for the population to grow from 8 billion to 9 billion? Enter your answer here: How many years will it take for the population to grow from 9 billion to 10 billion? Enter your answer here: At this rate, the rate of growth of the world's human population is