pre_text: Contractual Obligations The following table summarizes the payments due by fiscal year for our outstanding contractual obligations as of June 30, 2019: (a) Refer to Note 11 – Debt of the Notes to Financial Statements. (b) Refer to Note 7 – Property and Equipment of the Notes to Financial Statements. (c) Refer to Note 15 – Leases of the Notes to Financial Statements. (d) Refer to Note 12 – Income Taxes of the Notes to Financial Statements. (e) Amounts represent purchase commitments, including open purchase orders and take-or-pay contracts that are not presented as construction commitments above. (f) We have excluded long-term tax contingencies, other tax liabilities, and deferred income taxes of $14.2 billion from the amounts presented as the timing of these obligations is uncertain. We have also excluded unearned revenue and non-cash items.
table: (In millions) 2020 2021-2022 2023-2024 Thereafter Total
table: Long-term debt: (a)
table: Principal payments $ 5,518 $ 11,744 $ 8,000 $ 47,519 $ 72,781
table: Interest payments 2,299 4,309 3,818 29,383 39,809
table: Construction commitments (b) 3,443 515 0 0 3,958
table: Operating leases, including imputed interest (c) 1,790 3,144 2,413 3,645 10,992
table: Finance leases, including imputed interest (c) 797 2,008 2,165 9,872 14,842
table: Transition tax (d) 1,180 2,900 4,168 8,155 16,403
table: Purchase commitments (e) 17,478 1,185 159 339 19,161
table: Other long-term liabilities (f) 0 72 29 324 425
table: Total $  32,505 $  25,877 $  20,752 $  99,237 $  178,371
question: Analyse this data from a financial earnings document. How much do the top 3 contractual obligation terms add up to in 2020?