What was the Increases to accruals between 2017 and 2018?
{"Balances at beginning of period": {"2019": 2084, "2018": 2312, "2017": 2329}, "Warranty acquired in business combinations": {"2019": 4818, "2018": 305, "2017": 118}, "Increases to accruals": {"2019": 1752, "2018": 1606, "2017": 2029}, "Warranty expenditures": {"2019": -2249, "2018": -2127, "2017": -2184}, "Effect of changes in exchange rates": {"2019": 8, "2018": -12, "2017": 20}, "Balances at end of period": {"2019": 6413, "2018": 2084, "2017": 2312}}
increases_to_accruals_2018 = df["Increases to accruals"]["2018"]
increases_to_accruals_2017 = df["Increases to accruals"]["2017"]
answer = increases_to_accruals_2018 - increases_to_accruals_2017