What is the change in CTS adjusted EBITDA?
{"": {"Fiscal 2018": "", "Fiscal 2017": "(in millions)", "% Change": ""}, "Sales": {"Fiscal 2018": 670.7, "Fiscal 2017": 578.6, "% Change": 16.0}, "Operating income": {"Fiscal 2018": 60.4, "Fiscal 2017": 39.8, "% Change": 52.0}, "Adjusted EBITDA": {"Fiscal 2018": 73.3, "Fiscal 2017": 48.8, "% Change": 50.0}}
adjusted_ebitda_fiscal_2018 = df["Adjusted EBITDA"]["Fiscal 2018"]
adjusted_ebitda_fiscal_2017 = df["Adjusted EBITDA"]["Fiscal 2017"]
answer = adjusted_ebitda_fiscal_2018 - adjusted_ebitda_fiscal_2017