- it’s free
- it’s measured in per passenger kilometer
- you can freely add & remove stuff to the chart & table as needed
- it has legit sources
- it’s from 2018 data
Click it. Click iiiiiit. Also interesting for the layman who is curious about this sorta stuff!
Graph’s to the right near the top. Also has a table & ability to download. Note the “Add Travel Source” button at the top of the chart.