Key debt ratio

*Debt Key ratios ()**	31.12.2018	31.12.2017	31.12.2016	31.12.2015
Debt Ratio (Adjusted Net Financial Debt/Adjusted Net invested capital)	53.7%	51.6%	51.6%	56.1%
Debt Ratio (Adjusted Net Financial Debt/ EBITDA)	3.4	3.2	3.2	3.9
(*) Since January 1, 2018 the TIM Group has adopted the IFRS 9 accounting standards (Financial Instruments) retrospectively - using the specific exemptions in the standard and without restarting comparative figures of previous periods - and the IFRS 15 accounting standard (Revenues from contracts with customers) using the modified retrospective method. Consequently operating and financial data of previous years have not been restated. In addition, as allowed by the IFRS 9, the TIM Group decided to continue to appy the edge accounting provisions contained in IAS 39 instead of those of IFRS 9