What was the change in Leasehold improvements from 2018 to 2019?
{"Land": {"2019": 19490, "2018": 17655, "Useful Life": ""}, "Buildings and improvements": {"2019": 173333, "2018": 165535, "Useful Life": 5}, "Equipment, furniture and fixtures": {"2019": 389225, "2018": 359721, "Useful Life": 3}, "Leasehold improvements": {"2019": 94878, "2018": 89399, "Useful Life": "shorter of asset life or lease term"}, "": {"2019": 676926, "2018": 632310, "Useful Life": ""}, "Accumulated depreciation and amortization": {"2019": -353492, "2018": -320517, "Useful Life": ""}, "Property and equipment, net": {"2019": 323434, "2018": 311793, "Useful Life": ""}}
leasehold_improvements_2019 = df["Leasehold improvements"]["2019"]
leasehold_improvements_2018 = df["Leasehold improvements"]["2018"]
answer = leasehold_improvements_2019 - leasehold_improvements_2018