What is the difference in total fees for FY19 comapred to FY18?
{"Audit fees(1)": {"FY19": 12464329, "FY18": 11370525}, "Audit related fees(2)": {"FY19": 1142383, "FY18": 753689}, "Tax fees(3)": {"FY19": 161685, "FY18": 469449}, "All other fees(4)": {"FY19": 0, "FY18": 311000}, "Total fees": {"FY19": 13768398, "FY18": 12904663}}
total_fees_FY19 = df["Total fees"]["FY19"]
total_fees_FY18 = df["Total fees"]["FY18"]
answer = total_fees_FY19 - total_fees_FY18