This is the wrong statistic! It doesnt matter how often you take the train, but how far you go. There is something called a passenger kilometer. Someone traveling one kilometer by train makes one passenger kilometer, 6 people on a train going 10 kilometers makes 60 passenger kilometers. The same can be done for other modes of transportation. The modal split (the right statistic) then shows how much each mode of transportation is actually used. Here you can find the statistic for each country of the EU: https://www.eea.europa.eu/data-and-maps/daviz/passenger-transport-modal-split-2#tab-chart_1

A few examples why modal split is better than frequencies:

• Environmentally CO2 is emitted per kilometer. Someone may bike a short distance everyday to work, but visits his parents who live far away every weekend by car.
• On the way to work someone could take the car and the train on the same commute.

Finland is missing

https://www.euronews.com/next/2023/09/22/riding-the-rails-which-country-travels-the-most-by-train-in-europe

Here's the article this image arms to be based on, which includes many more counties.

I fully understand not wanting to use a train in Greece.
https://www.dw.com/en/greece-train-crash-government-admits-decades-of-failure/a-64864913

A probe into the tragedy would focus on the "chronic delays in implementing railway works, delays caused by chronic public sector malaise and decades of failure," government spokesman Yiannis Economou told reporters in Athens.

That said, I feel all European countries, maybe except of Switzerland, have failed to proper care for their rail infrastructure and missed the chance to convince more people to travel with trains instead of cars. :(

I'd use the train if we had one

Well sure but that’s because Switzerland has a pretty awesome and geographically-appropriate-for-its-size train system.