What is the increase / (decrease) in the Lease commitment from 2020 to 2021?
{"": {"Lease Commitment": "$", "Non-Lease Commitment": "$", "Total Commitment": "$"}, "Payments -- 2020": {"Lease Commitment": 69617, "Non-Lease Commitment": 37089, "Total Commitment": 106706}, "Payments -- 2021": {"Lease Commitment": 54195, "Non-Lease Commitment": 26948, "Total Commitment": 81143}, "Payments -- 2022": {"Lease Commitment": 22978, "Non-Lease Commitment": 8189, "Total Commitment": 31167}, "Payments -- 2023": {"Lease Commitment": 9227, "Non-Lease Commitment": "-", "Total Commitment": 9227}, "Payments -- 2024": {"Lease Commitment": 5713, "Non-Lease Commitment": "-", "Total Commitment": 5713}, "Payments -- Thereafter": {"Lease Commitment": "-", "Non-Lease Commitment": "-", "Total Commitment": "-"}, "Payments -- Total payments": {"Lease Commitment": 161730, "Non-Lease Commitment": 72226, "Total Commitment": 233956}, "Payments -- Less: imputed interest": {"Lease Commitment": -13128, "Non-Lease Commitment": "", "Total Commitment": ""}, "Payments -- Carrying value of operating lease liabilities": {"Lease Commitment": 148602, "Non-Lease Commitment": "", "Total Commitment": ""}, "Payments -- Less current portion": {"Lease Commitment": -61431, "Non-Lease Commitment": "", "Total Commitment": ""}, "Payments -- Carrying value of long-term operating lease liabilities": {"Lease Commitment": 87171, "Non-Lease Commitment": "", "Total Commitment": ""}}
lease_commitment_2021 = df["Payments -- 2021"]["Lease Commitment"]
lease_commitment_2020 = df["Payments -- 2020"]["Lease Commitment"]
answer = lease_commitment_2021 - lease_commitment_2020