I haven't filed my taxes in a few years, but I don't remember the last time I did, how can I find out?

I want to know where I can find out the last time I filed my taxes, I've been in and out of the country and haven't done them in a few years, but I'm not sure the exact year I did them last. Also how can I get W2's for my un-filed taxes? Thank you all very much.
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