What was the percentage change in the total other non-current assets between 2018 and 2019?
{"Property records database": {"2019": 60.1, "2018": 59.9}, "Contract assets": {"2019": 37.8, "2018": 17.0}, "Right-of-use assets": {"2019": 26.4, "2018": "\u2014"}, "Deferred compensation plan related assets": {"2019": 15.2, "2018": 11.1}, "Unbilled receivables": {"2019": 3.5, "2018": 5.0}, "Prepaid expenses": {"2019": 8.1, "2018": 18.3}, "Unrealized gains on interest rate swaps": {"2019": "\u2014", "2018": 6.2}, "Other": {"2019": 7.7, "2018": 4.3}, "Other non-current assets": {"2019": 158.8, "2018": 121.8}}
total_other_noncurrent_assets_2019 = df["Other non-current assets"]["2019"]
total_other_noncurrent_assets_2018 = df["Other non-current assets"]["2018"]
answer = (total_other_noncurrent_assets_2019 - total_other_noncurrent_assets_2018) / total_other_noncurrent_assets_2018 * 100.0