What was the change in Restricted cash within other assets between 2019 and 2020?
{"Cash and cash equivalents": {"January 31, 2020": 2915, "February 1, 2019": 3532}, "Restricted cash within other current assets": {"January 31, 2020": 83, "February 1, 2019": 35}, "Restricted cash within other assets": {"January 31, 2020": 33, "February 1, 2019": 29}, "Total cash, cash equivalents and restricted cash": {"January 31, 2020": 3031, "February 1, 2019": 3596}}
restricted_cash_2020 = df["Restricted cash within other assets"]["January 31, 2020"]
restricted_cash_2019 = df["Restricted cash within other assets"]["February 1, 2019"]
answer = restricted_cash_2020 - restricted_cash_2019