"Using this kind of graph one can more easily see" False, I cannot tell what is happening in this graph. It's hard to go back and forth between the graph and

"Using this kind of graph one can more easily see" False, I cannot tell what is happening in this graph. It's hard to go back and forth between the graph and the legend to tell what year it is. One way to improve the readability is to have the color shift uniformly between one PAST color and one PRESENT color so I can follow the line from the past to the present. While animation rarely improves graphs, it really can if time is the 3rd dimension your 2d visualization (image) needs. Something like this http://www.climate-lab-book.ac.uk/spirals/ http://www.climate-lab-book.ac.uk/spirals/ (first gif)