What was the percentage change in total cost of property and equipment between 2018 and 2019?
{"Land": {"2019": 1, "2018": 1}, "Buildings": {"2019": 4, "2018": 4}, "Leasehold improvements": {"2019": 252, "2018": 248}, "Computer equipment": {"2019": 654, "2018": 700}, "Office furniture and other equipment": {"2019": 91, "2018": 99}, "Total cost of property and equipment": {"2019": 1002, "2018": 1052}, "Less accumulated depreciation": {"2019": -749, "2018": -770}, "Property and equipment, net": {"2019": 253, "2018": 282}}
total_cost_2019 = df["Total cost of property and equipment"]["2019"]
total_cost_2018 = df["Total cost of property and equipment"]["2018"]
answer = (total_cost_2019 - total_cost_2018) / total_cost_2018 * 100.0