Firstly, they highlight the logical importance of the issue and provide evidence for the writer's contention. Statistics provide a type of evidence that is difficult to refute. Secondly, the use of statistics can aid a writer's credibility by demonstrating that they have researched an issue.
Hey there! I need more details to answer this question. Is this true or false question and are we talking about billions of dollars throughout the decade or from the start of the government to the end of the decade.