What is the difference between land from 2018 to 2019?
{"Land": {"2019": 14241, "2018": 14382}, "Buildings and improvements .": {"2019": 664266, "2018": 567605}, "Machinery and equipment .": {"2019": 2436997, "2018": 1826434}, "Office equipment and furniture .": {"2019": 159848, "2018": 178011}, "Leasehold improvements": {"2019": 48772, "2018": 49055}, "Construction in progress": {"2019": 243107, "2018": 405581}, "Property, plant and equipment, gross": {"2019": 3567231, "2018": 3041068}, "Accumulated depreciation .": {"2019": -1386082, "2018": -1284857}, "Property, plant and equipment, net": {"2019": 2181149, "2018": 1756211}}
land_2019 = df["Land"]["2019"]
land_2018 = df["Land"]["2018"]
answer = land_2019 - land_2018