What was the change in cash between 2018 and 2019?
{"Cash": {"April 26, 2019": 2216, "April 26, 2018": 2727}, "Cash equivalents": {"April 26, 2019": 109, "April 26, 2018": 214}, "Cash and cash equivalents": {"April 26, 2019": 2325, "April 26, 2018": 2941}, "Short-term restricted cash": {"April 26, 2019": 5, "April 26, 2018": 5}, "Long-term restricted cash": {"April 26, 2019": 1, "April 26, 2018": 1}, "Restricted cash": {"April 26, 2019": 6, "April 26, 2018": 6}, "Cash, cash equivalents and restricted cash": {"April 26, 2019": 2331, "April 26, 2018": 2947}}
cash_april_26_2019 = df["Cash"]["April 26, 2019"]
cash_april_26_2018 = df["Cash"]["April 26, 2018"]
answer = cash_april_26_2019 - cash_april_26_2018