Divorced in 2016 with alimony. That alimony would increase 2022. Do I pay taxes on the orginal amount or whole amount?

I divorced in 2016. I was awarded a certain amount of alimony a year. in the divorce decree my ex and i agreed in 2022 the alimony would increase by $3000. Do I have to claim the whole amount as income or only the original amount that was before 2019?