What was the percentage change in the total net property and equipment between 2018 and 2019?
{"Property and equipment, net: -- United States": {"July 27, 2019": 2266, "July 28, 2018": 2487, "July 29, 2017": 2711}, "Property and equipment, net: -- International": {"July 27, 2019": 523, "July 28, 2018": 519, "July 29, 2017": 611}, "Property and equipment, net: -- Total": {"July 27, 2019": 2789, "July 28, 2018": 3006, "July 29, 2017": 3322}}
net_property_2019 = df["Property and equipment, net: -- Total"]["July 27, 2019"]
net_property_2018 = df["Property and equipment, net: -- Total"]["July 28, 2018"]
answer = (net_property_2019 - net_property_2018) / net_property_2018 * 100.0