What is the percentage change in cash and cash equivalents between 2018 and 2019?
{"Cash and cash equivalents": {"2019": 259067, "2018": 256947}, "Restricted cash included in other assets": {"2019": 304, "2018": 304}, "Cash, cash equivalents and restricted cash shown in the statement of cash flows": {"2019": 259371, "2018": 257251}}
cash_2019 = df["Cash and cash equivalents"]["2019"]
cash_2018 = df["Cash and cash equivalents"]["2018"]
answer = (cash_2019 - cash_2018) / cash_2018 * 100.0