What was the change in the Equity method investments included in other assets between 2018 and 2019?
{"Available-for-sale debt investments": {"July 27, 2019": 21660, "July 28, 2018": 37009}, "Marketable equity securities": {"July 27, 2019": 3, "July 28, 2018": 605}, "Total investments": {"July 27, 2019": 21663, "July 28, 2018": 37614}, "Non-marketable equity securities included in other assets (1)": {"July 27, 2019": 1113, "July 28, 2018": 978}, "Equity method investments included in other assets": {"July 27, 2019": 87, "July 28, 2018": 118}, "Total": {"July 27, 2019": 22863, "July 28, 2018": 38710}}
equity_method_investments_2019 = df["Equity method investments included in other assets"]["July 27, 2019"]
equity_method_investments_2018 = df["Equity method investments included in other assets"]["July 28, 2018"]
answer = equity_method_investments_2019 - equity_method_investments_2018