What was the increase / (decrease) in the Average remuneration of Supervisory Board Members from 2018 to 2019?
{"Directors' remuneration -- Average remuneration of Supervisory Board Members(1)": {"2019": 105066, "2018": 115618, "2017": 123281}, "Company's performance -- Net revenues (amounts in millions)": {"2019": 9556, "2018": 9664, "2017": 8347}, "Company's performance -- Operating income (amounts in millions)": {"2019": 1203, "2018": 1400, "2017": 1005}, "Average remuneration of all global indirect employees (FTE basis) (3) -- Employees": {"2019": 97300, "2018": 100600, "2017": 93500}}
directors_remuneration_2019 = df["Directors' remuneration -- Average remuneration of Supervisory Board Members(1)"]["2019"]
directors_remuneration_2018 = df["Directors' remuneration -- Average remuneration of Supervisory Board Members(1)"]["2018"]
answer = directors_remuneration_2019 - directors_remuneration_2018