What is the change in the change in estimate relating to prior periods for current taxes?
{"Current taxes -- Current taxes": {"2019": -761, "2018": -775}, "Current taxes -- Uncertain tax positions": {"2019": 6, "2018": 8}, "Current taxes -- Change in estimate relating to prior periods": {"2019": 22, "2018": 12}, "Deferred taxes -- Deferred taxes relating to the origination and reversal of temporary differences": {"2019": -322, "2018": -352}, "Deferred taxes -- Change in estimate relating to prior periods": {"2019": -8, "2018": 8}, "Deferred taxes -- Recognition and utilization of loss carryforwards": {"2019": -106, "2018": 44}, "Deferred taxes -- Effect of change in provincial corporate tax rate": {"2019": 27, "2018": "\u2013"}, "Deferred taxes -- Uncertain tax positions": {"2019": 9, "2018": 60}, "Deferred taxes -- Total income taxes": {"2019": -1133, "2018": -995}}
current_taxes_change_in_estimate_relating_to_prior_periods_2019 = df["Current taxes -- Change in estimate relating to prior periods"]["2019"]
current_taxes_change_in_estimate_relating_to_prior_periods_2018 = df["Current taxes -- Change in estimate relating to prior periods"]["2018"]
answer = current_taxes_change_in_estimate_relating_to_prior_periods_2019 - current_taxes_change_in_estimate_relating_to_prior_periods_2018