What is the percentage change in the net operating loss carry forwards and credits from 2018 to 2019?
{"Deferred income tax assets (liabilities): -- Intangibles": {"September 30, 2019": -75190, "September 30, 2018": -70467}, "Deferred income tax assets (liabilities): -- Property and equipment depreciation": {"September 30, 2019": -521586, "September 30, 2018": -552119}, "Deferred income tax assets (liabilities): -- Net operating loss carry forwards and credits": {"September 30, 2019": 377505, "September 30, 2018": 464274}, "Deferred income tax assets (liabilities): -- Stock-based compensation": {"September 30, 2019": 114118, "September 30, 2018": 151558}, "Deferred income tax assets (liabilities): -- Inventories": {"September 30, 2019": 350197, "September 30, 2018": 400111}, "Deferred income tax assets (liabilities): -- Prepaid expenses": {"September 30, 2019": -63252, "September 30, 2018": -60806}, "Deferred income tax assets (liabilities): -- Accrued expenses and reserves": {"September 30, 2019": 371414, "September 30, 2018": 250787}, "Deferred income tax assets (liabilities): -- Goodwill": {"September 30, 2019": -607882, "September 30, 2018": -583415}, "Deferred income tax assets (liabilities): -- Gross deferred tax liability": {"September 30, 2019": -54676, "September 30, 2018": -77}, "Deferred income tax assets (liabilities): -- Valuation allowance": {"September 30, 2019": -47014, "September 30, 2018": -104858}, "Deferred income tax assets (liabilities): -- Net deferred tax liability": {"September 30, 2019": -101690, "September 30, 2018": -104935}}
net_loss_2019 = df["Deferred income tax assets (liabilities): -- Net operating loss carry forwards and credits"]["September 30, 2019"]
net_loss_2018 = df["Deferred income tax assets (liabilities): -- Net operating loss carry forwards and credits"]["September 30, 2018"]
answer = (net_loss_2019 - net_loss_2018) / net_loss_2018 * 100.0