What is the percentage change in the stock compensation expense from 2018 to 2019?
{"Net taxable (loss) at effective tax rates": {"2019": -2508, "2018": -1567}, "Stock compensation expense": {"2019": 119, "2018": 358}, "Amortization of debt discount": {"2019": 94, "2018": 10}, "Impairment of goodwill": {"2019": "-", "2018": 519}, "Other": {"2019": -223, "2018": -153}, "Valuation allowance": {"2019": 2518, "2018": 833}, "Income tax expense": {"2019": "$-", "2018": "$-"}}
stock_compensation_expense_2019 = df["Stock compensation expense"]["2019"]
stock_compensation_expense_2018 = df["Stock compensation expense"]["2018"]
answer = ( stock_compensation_expense_2019 - stock_compensation_expense_2018 ) / stock_compensation_expense_2018 * 100.0