You are being asked for your 2018 AGI so that you can e-file your 2019 return. That is how the IRS matches you up with the same person who used the SSN last year for a 2019 return.
https://ttlc.intuit.com/community/agi/help/how-do-i-find-last-year-s-agi/01/25947
https://ttlc.intuit.com/community/prior-year-return/help/how-do-i-access-my-prior-year-return/00/270...
Your 2018 tax return shows your 2018 Adjusted Gross Income (AGI) If you filed a joint return then the AGI is the same for each of you.
Form 1040 line 7
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