How do i fill in rows of data with previous row info?

Is there a way you can add a row number to your original dataset? We can in theory do this in ETL but without having a real column to sort on, I'm not sure if the method I've used that worked for a small dataset will keep on working all the time.

Original:

Backfilled (you could rename or remove columns as needed, but I left most there so that you'd know where this comes from, the way it has been structure will also allow it to be backfill should the year in Row 4 would be missing):

This is what the ETL Looks like:

And here's the code you could copy to the clipboard and paste to have it recreated on your end:

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Let us know if this helps!