answer given questions with 40 words each questions are about golf

Module 9: Why do you think the average green speed has increased over time?

In this module we learned all about golf course maintenance. We also learned how much of an impact maintenance had on a golf course. For example, it can even change the green speed, which is how far the ball rolls on the green. In our lecture about green speed there is a graph that shows the average green speed in has increased dramatically over the years. I also found an article for another reference that lists the average green speed right now at 6.5 feet. Why do you think the average green speed has increased over time?