What was the change in Total related party expenses, net between 2018 and 2019?
{"Data entry, indexing services and other operating expenses": {"2019(1)": 8.8, "2018": 8.2, "2017": 5.1}, "Corporate services": {"2019(1)": 3.8, "2018": 4.9, "2017": 9.2}, "Technology and corporate services": {"2019(1)": -0.1, "2018": -1.0, "2017": -1.7}, "Total related party expenses, net": {"2019(1)": 12.5, "2018": 12.1, "2017": 12.6}}
total_related_party_expenses_net_2019 = df["Total related party expenses, net"]["2019(1)"]
total_related_party_expenses_net_2018 = df["Total related party expenses, net"]["2018"]
answer = total_related_party_expenses_net_2019 - total_related_party_expenses_net_2018