What is the percentage change in the total deferred tax assets from 2018 to 2019?
{"Deferred Tax Assets: -- Net operating loss carry forwards": {"2019": 20772428, "2018": 20342559}, "Deferred Tax Assets: -- Intangibles": {"2019": 207618, "2018": 318178}, "Deferred Tax Assets: -- Credits": {"2019": 28022, "2018": 112086}, "Deferred Tax Assets: -- Other": {"2019": 506349, "2018": 613202}, "Deferred Tax Assets: -- Total deferred tax assets": {"2019": 21514417, "2018": 21386025}, "Deferred Tax Liabilities: -- Intangibles": {"2019": "\u2013", "2018": "\u2013"}, "Deferred Tax Liabilities: -- Total deferred tax liabilities": {"2019": "\u2013", "2018": "\u2013"}, "Deferred Tax Liabilities: -- Valuation allowance": {"2019": -21486396, "2018": -21386025}, "Deferred Tax Liabilities: -- Net deferred tax asset": {"2019": 28021, "2018": "$\u2013"}}
total_deferred_tax_assets_2019 = df["Deferred Tax Assets: -- Total deferred tax assets"]["2019"]
total_deferred_tax_assets_2018 = df["Deferred Tax Assets: -- Total deferred tax assets"]["2018"]
answer = (total_deferred_tax_assets_2019 - total_deferred_tax_assets_2018) / total_deferred_tax_assets_2018 * 100.0