What was the change in the net property, plant and equipment in China between 2018 and 2019?
{"United States": {"2019": 57095, "2018": 49530}, "Japan": {"2019": 89602, "2018": 79855}, "Thailand": {"2019": 82389, "2018": 74100}, "Mexico": {"2019": 121147, "2018": 62503}, "Italy": {"2019": 35197, "2018": 39398}, "China": {"2019": 45815, "2018": 36396}, "Portugal": {"2019": 31872, "2018": 29073}, "Macedonia": {"2019": 12906, "2018": 13723}, "Bulgaria": {"2019": 5480, "2018": 5597}, "Sweden": {"2019": 4800, "2018": 6005}, "Other (1)": {"2019": 8977, "2018": 9136}, "Total Non-United States": {"2019": 438185, "2018": 355786}, "": {"2019": 495280, "2018": 405316}}
china_2019 = df["China"]["2019"]
china_2018 = df["China"]["2018"]
answer = china_2019 - china_2018