Hello! Looking at the numbers, you can see that the population of a country goes up by 1 million people each year. You could also say that it goes up by 2 million every 2 years. At this rate, the population in 2003 was 40 million. This is because 1997-2003 are 6 years apart. Do 1 million * 6 to get 6 million and add that to 34 million from 1997 to get 40 million in 2003.
