What is the percentage change in the company's net operating loss and credit carry-forwards between 2018 and 2019?
{"Deferred tax assets -- Net operating loss and credit carry-forwards": {"2019": 196930, "2018": 109812}, "Deferred tax assets -- Research and development credits": {"2019": 24452, "2018": 16380}, "Deferred tax assets -- Sales tax liability": {"2019": 157, "2018": 258}, "Deferred tax assets -- Share-based compensation": {"2019": 5937, "2018": 5435}, "Deferred tax assets -- Accrued liabilities": {"2019": 6612, "2018": 5135}, "Deferred tax assets -- Gross deferred tax assets": {"2019": 234088, "2018": 137020}, "Deferred tax assets -- Valuation allowance": {"2019": -180090, "2018": -94118}, "Deferred tax assets -- Total deferred tax assets": {"2019": 53998, "2018": 42902}, "Deferred tax liabilities -- Convertible debt discount": {"2019": -16701, "2018": -21035}, "Deferred tax liabilities -- Deferred sales commissions": {"2019": -28601, "2018": -18253}, "Deferred tax liabilities -- Acquired intangibles": {"2019": -3857, "2018": -2670}, "Deferred tax liabilities -- Property and equipment": {"2019": -6731, "2018": -3573}, "Deferred tax liabilities -- Net deferred tax (liabilities) assets": {"2019": -1892, "2018": -2629}}
net_operating_loss_and_credit_carryforwards_2019 = df["Deferred tax assets -- Net operating loss and credit carry-forwards"]["2019"]
net_operating_loss_and_credit_carryforwards_2018 = df["Deferred tax assets -- Net operating loss and credit carry-forwards"]["2018"]
answer = ( net_operating_loss_and_credit_carryforwards_2019 - net_operating_loss_and_credit_carryforwards_2018 ) / net_operating_loss_and_credit_carryforwards_2018 * 100.0