What was the percentage change in Net cash provided by operating activities between 2018 and 2019?
{"Net cash provided by operating activities": {"2019": 153327, "2018": 256426}, "Net cash used in investing activities": {"2019": -15381, "2018": -6581}, "Net cash used in financing activities": {"2019": -159608, "2018": -154210}, "Net increase (decrease) in cash and cash equivalents and restricted cash": {"2019": -21662, "2018": 95635}, "Cash and cash equivalents and restricted cash at beginning of period": {"2019": 449473, "2018": 353838}, "Cash and cash equivalents and restricted cash at end of period": {"2019": 427811, "2018": 449473}}
net_cash_2019 = df["Net cash provided by operating activities"]["2019"]
net_cash_2018 = df["Net cash provided by operating activities"]["2018"]
answer = (net_cash_2019 - net_cash_2018) / net_cash_2018 * 100.0