The actuary for the pension plan of Gustafson, Inc. calculated the following net gains and losses. Incurred During The Year (Gain) or Loss 2020 $ 250,000 2021 (20,000) 2022 100,000 2023 (125,000) 2024 90,000 ther information about the company's pension obligation and plan assets is as follows. As of January 1, PBO Plan Assets 2020 $1,800,000 $ 1,700,000 2021 1,900,000 1,850,000 2021 1,900,000 1,850,000 2022 2,100,000 2,000,000 2023 2,000,000 2,150,000 2024 1,950,000 2,100,000 What is the corridor for 2020-2024? Year Corridor 2020 2021 2022 2023 2024