What was the percentage change in the total depreciation between 2017 and 2018?
{"Depreciation:       -- AMER ": {"2019": 22531, "2018": 21224, "2017": 19694}, "Depreciation:       -- APAC ": {"2019": 16905, "2018": 15954, "2017": 15588}, "Depreciation:       -- EMEA ": {"2019": 6105, "2018": 6054, "2017": 5467}, "Depreciation:       -- Corporate ": {"2019": 5344, "2018": 4863, "2017": 4581}, "Depreciation:       -- ": {"2019": 50885, "2018": 48095, "2017": 45330}, "Capital expenditures: -- AMER": {"2019": 42459, "2018": 17690, "2017": 18111}, "Capital expenditures: -- APAC": {"2019": 33454, "2018": 33018, "2017": 13816}, "Capital expenditures: -- EMEA": {"2019": 5186, "2018": 7923, "2017": 5748}, "Capital expenditures: -- Corporate": {"2019": 9501, "2018": 4149, "2017": 863}, "Capital expenditures: -- ": {"2019": 90600, "2018": 62780, "2017": 38538}}
depreciation_2018 = df["Depreciation:       -- "]["2018"]
depreciation_2017 = df["Depreciation:       -- "]["2017"]
answer = (depreciation_2018 - depreciation_2017) / depreciation_2017 * 100.0