What was the change in the employee benefit from 2018 to 2019?
{"Deferred Tax Assets -- Employee benefits": {"2019": 5048, "2018": 5403}, "Deferred Tax Assets -- Tax loss and credit carry forwards": {"2019": 3012, "2018": 3576}, "Deferred Tax Assets -- Other  assets": {"2019": 5595, "2018": 1650}, "Deferred Tax Assets -- ": {"2019": 13655, "2018": 10629}, "Deferred Tax Assets -- Valuation allowances": {"2019": -2260, "2018": -2741}, "Deferred Tax Assets -- Deferred tax assets": {"2019": 11395, "2018": 7888}, "Deferred Tax Liabilities -- Spectrum and other intangible amortization": {"2019": 22388, "2018": 21976}, "Deferred Tax Liabilities -- Depreciation": {"2019": 16884, "2018": 15662}, "Deferred Tax Liabilities -- Otherliabilities": {"2019": 6742, "2018": 3976}, "Deferred Tax Liabilities -- Deferred tax liabilities": {"2019": 46014, "2018": 41614}, "Deferred Tax Liabilities -- Net deferred tax liability": {"2019": 34619, "2018": 33726}}
employee_benefit_2019 = df["Deferred Tax Assets -- Employee benefits"]["2019"]
employee_benefit_2018 = df["Deferred Tax Assets -- Employee benefits"]["2018"]
answer = employee_benefit_2019 - employee_benefit_2018