What is the percentage change in accruals for warranties issued from 2018 to 2019?
{"Balance at the beginning of the period": {"December 29, 2019": 172266, "December 30, 2018": 181303, "December 31, 2017": 161209}, "Accruals for warranties issued during the period": {"December 29, 2019": 27717, "December 30, 2018": 31628, "December 31, 2017": 29689}, "Settlements and adjustments during the period": {"December 29, 2019": -61538, "December 30, 2018": -40665, "December 31, 2017": -9595}, "Balance at the end of the period": {"December 29, 2019": 138445, "December 30, 2018": 172266, "December 31, 2017": 181303}}
accruals_2019 = df["Accruals for warranties issued during the period"]["December 29, 2019"]
accruals_2018 = df["Accruals for warranties issued during the period"]["December 30, 2018"]
answer = ( accruals_2019 - accruals_2018 ) / accruals_2018 * 100.0