It depends.
You should try to contact the employer first to see if they can send you a copy of your W-2 Form from that year.
If you are unsuccessful there, you can always refer to the following information on the IRS website. You can either request a copy if you submitted a copy of your W-2 with your tax return. Or you can contact the Social Security administration to request a copy as well.
IRS request for W-2 Forms
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