The next step in your study will be to investigate how the number of students with heavy student loan debt at Private University X has increased or decreased over time. The raw numbers for 2017 were: 8,000 students in the graduating class, 5,500 of which had $25,000 or more in student loans and 2,500 of which had less than $25,000 in loans. The raw numbers for 2010 were: 6,500 students were in the graduating class, 3,200 of which had $25,000 or more in student loans, and 3,300 of which had less than $25,000 in loans. Which type of statistic should you use to accomplish your goal