What was the change in Prepaid and refundable income taxes from 2018 to 2019?
{"Prepaid and refundable income taxes": {"2019": 44096, "2018": 37884}, "Other taxes receivable": {"2019": 11208, "2018": 16930}, "Prepaid expenses and other assets": {"2019": 22689, "2018": 30266}, "Total prepaid expenses and other assets": {"2019": 77993, "2018": 85080}}
prepaid_and_refundable_income_taxes_2019 = df["Prepaid and refundable income taxes"]["2019"]
prepaid_and_refundable_income_taxes_2018 = df["Prepaid and refundable income taxes"]["2018"]
answer = prepaid_and_refundable_income_taxes_2019 - prepaid_and_refundable_income_taxes_2018