I don’t like line graphs. They’re a kind of smoothing, but almost never the right choice. The first two graphs are smooth enough that it hardly matters what you do, but I redid the third as a scatterplot plus a loess curve.
Here’s the loess superimposed on the line graph, if you want to compare them. I got the data here, linked from here
I know you didn’t make the graphs, but …
I don’t like line graphs. They’re a kind of smoothing, but almost never the right choice. The first two graphs are smooth enough that it hardly matters what you do, but I redid the third as a scatterplot plus a loess curve.
Here’s the loess superimposed on the line graph, if you want to compare them. I got the data here, linked from here