What was the percentage change in METRO AG in 2019 from 2018?
{"METRO": {"2018": 86239, "2019": 82979}, "METRO Germany": {"2018": 11816, "2019": 11760}, "METRO Western Europe (excl.Germany)": {"2018": 24073, "2019": 24044}, "METRO Russia": {"2018": 13884, "2019": 12288}, "METRO Eastern Europe (excl.Russia)": {"2018": 28264, "2019": 27589}, "METRO Asia": {"2018": 8202, "2019": 7298}, "Others": {"2018": 6916, "2019": 7067}, "METROAG": {"2018": 863, "2019": 837}, "Total": {"2018": 94018, "2019": 90883}}
metroag_2019 = df["METROAG"]["2019"]
metroag_2018 = df["METROAG"]["2018"]
answer = ( metroag_2019 - metroag_2018 ) / metroag_2018 * 100.0