What was the change in Income taxes receivable in 2019 from 2018?
{"Trade accounts receivable, current": {"2019": 378616.0, "2018": 338473.0}, "Income taxes receivable": {"2019": 1571.0, "2018": 916.0}, "Other": {"2019": 13440.0, "2018": 11132.0}, "Receivables, gross": {"2019": 393627.0, "2018": 350521.0}, "Less: Allowance for doubtful accounts": {"2019": 3480.0, "2018": 3096.0}, "Receivables,net": {"2019": 390147.0, "2018": 347425.0}, "Allowance for doubtful accounts as a percent of trade accounts receivable, current": {"2019": 0.9, "2018": 0.9}}
income_taxes_receivable_2019 = df["Income taxes receivable"]["2019"]
income_taxes_receivable_2018 = df["Income taxes receivable"]["2018"]
answer = income_taxes_receivable_2019 - income_taxes_receivable_2018