What is the percentage change in valuation allowance in 2019 compared to 2018?
{"Federal income tax benefit (expense) attributable to:         -- Current operations ": {"2019": 848000, "2018": -48000}, "Federal income tax benefit (expense) attributable to:         -- Acquisition costs  ": {"2019": -143000, "2018": "-"}, "Federal income tax benefit (expense) attributable to:         -- Change in fair value of contingent consideration  ": {"2019": -133000, "2018": "-"}, "Federal income tax benefit (expense) attributable to:         -- Other permanent items  ": {"2019": 29000, "2018": -36000}, "Federal income tax benefit (expense) attributable to:         -- Deferred Adjustment  ": {"2019": -913000, "2018": "-"}, "Federal income tax benefit (expense) attributable to:         -- Valuation allowance  ": {"2019": 1209960, "2018": 84000}, "Federal income tax benefit (expense) attributable to:         -- Net provision for federal income tax ": {"2019": 897960, "2018": "$-"}}
valuation_allowance_2019 = df["Federal income tax benefit (expense) attributable to:         -- Valuation allowance  "]["2019"]
valuation_allowance_2018 = df["Federal income tax benefit (expense) attributable to:         -- Valuation allowance  "]["2018"]
answer = (valuation_allowance_2019 - valuation_allowance_2018) / valuation_allowance_2018 * 100.0