What was the percentage change in the fair value of deferred income tax assets between 2018 and 2019?
{"Accounts and other receivable, net": {"Preliminary: December 31, 2018": 7167, "Measurement Period Adjustments": "$ -", "Adjusted: December 31, 2019": 7167}, "Inventories": {"Preliminary: December 31, 2018": 9372, "Measurement Period Adjustments": "-", "Adjusted: December 31, 2019": 9372}, "Property and equipment": {"Preliminary: December 31, 2018": 1353, "Measurement Period Adjustments": "-", "Adjusted: December 31, 2019": 1353}, "Goodwill": {"Preliminary: December 31, 2018": 48032, "Measurement Period Adjustments": -11774, "Adjusted: December 31, 2019": 36258}, "Intangible assets": {"Preliminary: December 31, 2018": 26000, "Measurement Period Adjustments": 17240, "Adjusted: December 31, 2019": 43240}, "Deferred income tax assets": {"Preliminary: December 31, 2018": 8116, "Measurement Period Adjustments": -1785, "Adjusted: December 31, 2019": 6331}, "Other assets": {"Preliminary: December 31, 2018": 5126, "Measurement Period Adjustments": 878, "Adjusted: December 31, 2019": 6004}, "Total assets acquired": {"Preliminary: December 31, 2018": 105166, "Measurement Period Adjustments": 4559, "Adjusted: December 31, 2019": 109725}, "Accounts payable": {"Preliminary: December 31, 2018": 5734, "Measurement Period Adjustments": "-", "Adjusted: December 31, 2019": 5734}, "Deferred income tax liabilities": {"Preliminary: December 31, 2018": 7984, "Measurement Period Adjustments": 3715, "Adjusted: December 31, 2019": 11699}, "Other liabilities": {"Preliminary: December 31, 2018": 6764, "Measurement Period Adjustments": 844, "Adjusted: December 31, 2019": 7608}, "Total liabilities assumed": {"Preliminary: December 31, 2018": 20482, "Measurement Period Adjustments": 4559, "Adjusted: December 31, 2019": 25041}, "Total fair value of net assets acquired": {"Preliminary: December 31, 2018": 84684, "Measurement Period Adjustments": "$  -", "Adjusted: December 31, 2019": 84684}}
deferred_income_tax_assets_2019 = df["Deferred income tax assets"]["Adjusted: December 31, 2019"]
deferred_income_tax_assets_2018 = df["Deferred income tax assets"]["Preliminary: December 31, 2018"]
answer = ( deferred_income_tax_assets_2019 - deferred_income_tax_assets_2018 ) / deferred_income_tax_assets_2018 * 100.0