What was the difference between EBITDA and NPAT for FY18?
{"Operating revenue": {"FY19": 231.3, "FY18": 230.8, "Variance %": 0.2}, "Underlying EBITDA 1, 3": {"FY19": 55.8, "FY18": 60.0, "Variance %": -7.0}, "Underlying NPAT 3": {"FY19": 24.0, "FY18": 29.5, "Variance %": -18.7}, "Underlying NPATA 2, 3": {"FY19": 33.7, "FY18": 38.7, "Variance %": -12.9}, "Basic EPS based on underlying NPATA (cents) 2": {"FY19": 17.1, "FY18": 19.8, "Variance %": -13.6}}
underlying_ebitda_1_3_fy18 = df["Underlying EBITDA 1, 3"]["FY18"]
underlying_npat_3_fy18 = df["Underlying NPAT 3"]["FY18"]
answer = underlying_ebitda_1_3_fy18 - underlying_npat_3_fy18