What was the percentage change in the Amortization included in interest expense between 2017 and 2019?
{"Net income (GAAP) (1)": {"2019": 206587, "2018": 254127, "2017": 47157}, "Non-GAAP adjustments: -- Equity (income) loss from equity method investments": {"2019": 3304, "2018": -76192, "2017": -41643}, "Non-GAAP adjustments: -- Acquisition (gain) loss": {"2019": "\u2014", "2018": -130880, "2017": "\u2014"}, "Non-GAAP adjustments: -- Change in value of TOKIN options": {"2019": "\u2014", "2018": "\u2014", "2017": -10700}, "Non-GAAP adjustments: -- (Gain) loss on write down and disposal of long-lived assets": {"2019": 1660, "2018": -992, "2017": 10671}, "Non-GAAP adjustments: -- Restructuring charges (2)": {"2019": 8779, "2018": 14843, "2017": 5404}, "Non-GAAP adjustments: -- R&D grant reimbursements and grant income": {"2019": -4559, "2018": "\u2014", "2017": "\u2014"}, "Non-GAAP adjustments: -- ERP integration costs/IT transition costs": {"2019": 8813, "2018": 80, "2017": 7045}, "Non-GAAP adjustments: -- Stock-based compensation": {"2019": 12866, "2018": 7657, "2017": 4720}, "Non-GAAP adjustments: -- Legal expenses/fines related to antitrust class actions": {"2019": 11896, "2018": 16636, "2017": 2640}, "Non-GAAP adjustments: -- Net foreign exchange (gain) loss": {"2019": -7230, "2018": 13145, "2017": -3758}, "Non-GAAP adjustments: -- TOKIN investment-related expenses": {"2019": "\u2014", "2018": "\u2014", "2017": 1101}, "Non-GAAP adjustments: -- Plant start-up costs (2)": {"2019": -927, "2018": 929, "2017": 427}, "Non-GAAP adjustments: -- Amortization included in interest expense": {"2019": 1872, "2018": 2467, "2017": 761}, "Non-GAAP adjustments: -- Income tax effect of non-GAAP adjustments": {"2019": -50012, "2018": -30, "2017": -741}, "Non-GAAP adjustments: -- Loss on early extinguishment of debt": {"2019": 15946, "2018": 486, "2017": "\u2014"}, "Non-GAAP adjustments: -- Adjusted net income (non-GAAP) (1)": {"2019": 208995, "2018": 102276, "2017": 23084}}
amortization_2019 = df["Non-GAAP adjustments: -- Amortization included in interest expense"]["2019"]
amortization_2017 = df["Non-GAAP adjustments: -- Amortization included in interest expense"]["2017"]
answer = (amortization_2019 - amortization_2017) / amortization_2017 * 100.0