I withdrew funds from my Roth IRA in 2024. TurboTax wants my contributions prior to 2024. I have no idea what that figure is. Why is TurboTax asking this.

I withdrew from my Roth IRA in 2024. TurboTax wants me to provide what my contributions were before 2024. I don't know what that figure is & neither does Vanguard. Why is TurboTax asking this question?