I wish they wouldn't have curved/smoothed the graphs. Since it's by year, there are discrete points and values. When you curve a line it has implications for the underlying data, which in this case are incorrect.
I originally didn't smooth the data, but it looked way too jagged and crappy for many of the names. Ultimately, I erred on the side of aesthetics and sacrificed the ability to look up exact numbers in the graph. Rest assured, though, if you want the exact numbers you can download the underlying data of every graph with one of the links under the graph.