What is the percentage change in the revenue losses in UK from 2018 to 2019?
{"Revenue losses  UK": {"2019": 398.4, "2018": 300.8}, "Capital losses  UK": {"2019": 34.5, "2018": 34.2}, "Derivative financial instruments": {"2019": 172.7, "2018": 184.9}, "Other temporary differences": {"2019": 20.1, "2018": 9.7}, "Total unrecognised temporary differences": {"2019": 625.7, "2018": 529.6}}
revenue_losses_uk_2019 = df["Revenue losses  UK"]["2019"]
revenue_losses_uk_2018 = df["Revenue losses  UK"]["2018"]
answer = ( revenue_losses_uk_2019 - revenue_losses_uk_2018 ) / revenue_losses_uk_2018 * 100.0