Edited, I didnt saw the time , those graphics in guildstats are not intuitive.
Btw , I dont see correct to give me -1 , I made a research , I found a tool and the only thing I was wrong was interpretating the charts and in addition to that I made my own graphic with my experience. Downvoting this type of answer is like you try to help but is not enough so lets take points from you :(