What is the percentage change in Book expenses not deductible for tax purposes from 2018 to 2019?
{"Tax benefit computed at the statutory rate": {"2019": -427244, "2018": -631497}, "State taxes": {"2019": 6525, "2018": 6874}, "Book expenses not deductible for tax purposes": {"2019": 2980, "2018": 2882}, "Rate Change": {"2019": 45656, "2018": "\u2013"}, "Other": {"2019": 2517, "2018": -27286}, "": {"2019": -369566, "2018": -649027}, "Change in valuation allowance for deferred tax assets": {"2019": 269203, "2018": 658650}, "Income tax (benefit) expense": {"2019": -100363, "2018": 9623}}
book_expenses_not_deductible_for_tax_purposes_2019 = df["Book expenses not deductible for tax purposes"]["2019"]
book_expenses_not_deductible_for_tax_purposes_2018 = df["Book expenses not deductible for tax purposes"]["2018"]
answer = ( book_expenses_not_deductible_for_tax_purposes_2019 - book_expenses_not_deductible_for_tax_purposes_2018 ) / book_expenses_not_deductible_for_tax_purposes_2018 * 100.0