How much assets were decapitalized from 2018 to 2019?
{"Building and improvements": {"2019": 1273, "2018": 1273}, "Scientific equipment": {"2019": 597, "2018": 598}, "Computer hardware and software": {"2019": 106, "2018": 107}, "Machinery and equipment": {"2019": 274, "2018": 275}, "Land and improvements": {"2019": 162, "2018": 162}, "Other personal property": {"2019": 70, "2018": 70}, "Office equipment": {"2019": 27, "2018": 27}, "": {"2019": 2509, "2018": 2512}, "Less: accumulated depreciation": {"2019": -1969, "2018": -1906}, "Total property, plant and equipment, net": {"2019": 540, "2018": 606}}
decapitalization_2018 = df[""]["2018"]
decapitalization_2019 = df[""]["2019"]
answer = decapitalization_2018 - decapitalization_2019