It's extremely easy to draw conclusions specifically because it's a linear chart about per capita economic output over a relatively short duration of time.
The conclusion is that Ireland has drastically outperformed all the other nations in the chart since 1990. I think it would be hard to read that chart any other way, it's extremely obvious. For example it's not difficult to see approximately where each nation starts out and where they end up. Nor is it difficult to see just how large the output gap has become between Ireland and the rest. Logarithmic would mess up the clear visual that Ireland is pulling away from everyone else.
The point of the chart, is to show how Ireland has gone from an underdog economy in the EU, to an affluent powerhouse, leaving the other major economies behind per capita.
Or, it shows that the point is incorrect.
> Logarithmic would mess up the clear visual that Ireland is pulling away from everyone else.
No, if you don't see Ireland pulling away from everyone else in a logarithmic chart then they are not pulling away.
If you only see that signal in a linear graph then you are misleading yourself by thinking that they are doing so.
> Nor is it difficult to see just how large the output gap has become between Ireland and the rest.
Exactly. The "large output gap" you see clearly does not exist if you don't see it on a logarithmic chart!
Please post it, let the data speak for itself. If there is a large gap we will see it, if not, we won't.