What was the percentage change in total cost from 2018 to 2019?
{"Progress shipyard installments": {"2018": 152075, "2019": 197637}, "Onsite supervision costs": {"2018": 5766, "2019": 3879}, "Critical spare parts, equipment and other vessel delivery expenses": {"2018": 1434, "2019": 1807}, "Total": {"2018": 159275, "2019": 203323}}
total_2019 = df["Total"]["2019"]
total_2018 = df["Total"]["2018"]
answer = ( total_2019 - total_2018 ) / total_2018 * 100.0