What were the changes in Additions from acquisition between 2018 and 2019?
{"Balances at beginning of period": {"2019": 1856, "2018": 1748}, "Additions from acquisition": {"2019": 1884, "2018": 416}, "Additions - charged to expense": {"2019": 4207, "2018": 109}, "Deductions - write-offs, net of recoveries": {"2019": -202, "2018": -417}, "Balances at end of period": {"2019": 7745, "2018": 1856}}
additions_from_acquisition_2019 = df["Additions from acquisition"]["2019"]
additions_from_acquisition_2018 = df["Additions from acquisition"]["2018"]
answer = additions_from_acquisition_2019 - additions_from_acquisition_2018