What was the percentage change in the amount available between 2018 and 2019?
{"Total credit facility": {"2019": 300000.0, "2018": 300000.0}, "Balance Outstanding": {"2019": 99700.0, "2018": 50000.0}, "Standby letters of credit": {"2019": 1800.0, "2018": 1940.0}, "Amount available": {"2019": 198500.0, "2018": 248060.0}, "Weighted-average interest rate": {"2019": 3.25, "2018": 3.1}, "Commitment fee percentage per annum": {"2019": 0.23, "2018": 0.2}}
amount_available_2019 = df["Amount available"]["2019"]
amount_available_2018 = df["Amount available"]["2018"]
answer = ( amount_available_2019 - amount_available_2018 ) / amount_available_2018 * 100.0