What is the percentage change in the interest expense, net of capitalised interest between 2017 and 2018?
{"Interest Expenses, net of capitalized interest  ": {"2019": 34018, "2018": 29753, "2017": 18286}, "Commitment Fee  ": {"2019": "-", "2018": 3325, "2017": 760}, "Amortization of Deferred Financing Costs  ": {"2019": 4372, "2018": 1470, "2017": 1393}, "Other financial costs  ": {"2019": "-", "2018": 1, "2017": 25}, "Total Interest Expenses  ": {"2019": 38390, "2018": 34549, "2017": 20464}}
interest_expense_2018 = df["Interest Expenses, net of capitalized interest  "]["2018"]
interest_expense_2017 = df["Interest Expenses, net of capitalized interest  "]["2017"]
answer = ( interest_expense_2018 - interest_expense_2017 ) / interest_expense_2017 * 100.0