What was the percentage change in Cash and cash equivalents between 2018 and 2019?
{"Cash and cash equivalents": {"2019": 119629, "2018": 146061, "2017": 96329}, "Accounts receivable, net": {"2019": 76373, "2018": 49510, "2017": 40634}, "Working capital": {"2019": 167879, "2018": 152793, "2017": 119433}}
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