What is the percentage change in the salaries and short-term employee benefits from 2018 to 2019?
{"Key management1 compensation -- m": {"2019": 2019.0, "2018": 2018.0}, "Key management1 compensation -- Salaries and short-term employee benefits": {"2019": 4.7, "2018": 4.9}, "Key management1 compensation -- Pensions and other post-employment benefits": {"2019": 0.3, "2018": 0.8}, "Key management1 compensation -- Share-based payments": {"2019": 1.5, "2018": 1.7}, "Key management1 compensation -- ": {"2019": 6.5, "2018": 7.4}}
salary_2019 = df["Key management1 compensation -- Salaries and short-term employee benefits"]["2019"]
salary_2018 = df["Key management1 compensation -- Salaries and short-term employee benefits"]["2018"]
answer = (salary_2019 - salary_2018) / salary_2018 * 100.0