How should I store my data?

I am creating an WPF/C# application that should present consumption (Water, electricity etc).

As you imagine this does not involve a lot of records, but it must import data from 1995 until today and forward, so 1000 records or less.

Normally I would prefer SQL database, but I do not have one available.

What is best practice? XML file, CSV-file or anything else?