What is the percentage of depreciation in the total deferred tax assets in 2018?
{"Deferred tax assets (liabilities): -- NOL carryover": {"2019": 5910, "2018": 3370}, "Deferred tax assets (liabilities): -- R&D carryover": {"2019": 173, "2018": 173}, "Deferred tax assets (liabilities): -- Other": {"2019": 236, "2018": 239}, "Deferred tax assets (liabilities): -- Depreciation": {"2019": 42, "2018": 61}, "Deferred tax assets (liabilities): -- ": {"2019": 6361, "2018": 3843}, "Deferred tax assets (liabilities): -- Less valuation allowance": {"2019": -6361, "2018": -3843}, "Deferred tax assets (liabilities): -- Net deferred tax asset": {"2019": "$-", "2018": "$-"}}
depreciation_2018 = df["Deferred tax assets (liabilities): -- Depreciation"]["2018"]
total_deferred_tax_assets_liabilities_2018 = df["Deferred tax assets (liabilities): -- "]["2018"]
answer = depreciation_2018 / total_deferred_tax_assets_liabilities_2018 * 100.0