What was the change in the Revolving Credit Facility from 2018 to 2019?
{"Revolving Credit Facility": {"April 27, 2019": 35.0, "April 28, 2018": 30.0}, "Term Loan": {"April 27, 2019": 243.7, "April 28, 2018": "\u2014"}, "Subsidiary Credit Facility": {"April 27, 2019": "\u2014", "April 28, 2018": 3.6}, "Other Debt": {"April 27, 2019": 16.8, "April 28, 2018": 24.2}, "Unamortized Debt Issuance Costs": {"April 27, 2019": -2.9, "April 28, 2018": "\u2014"}, "Total Debt": {"April 27, 2019": 292.6, "April 28, 2018": 57.8}, "Less: Current Maturities": {"April 27, 2019": -15.7, "April 28, 2018": -4.4}, "Total Long-term Debt": {"April 27, 2019": 276.9, "April 28, 2018": 53.4}}
revolving_credit_2019 = df["Revolving Credit Facility"]["April 27, 2019"]
revolving_credit_2018 = df["Revolving Credit Facility"]["April 28, 2018"]
answer = revolving_credit_2019 - revolving_credit_2018